Rough Idle - Codes P0151, P0174, P0300

The vehicle has this constant rough idle, so bad that at times it will drop to almost zero and then catch itself. I know there are a number of things that will cause this. Any tips on where to start?

I have a 2002 chevy tahoe that idles rough when its cold then when it warms up it stops. Check engine light came on and we had it checked and they said it was had codes of 106 BMP, 300 Misfire, 171 Lean and 172 Lean. They have cleaned the throttle body and MFAS but it didnt help. They also checked for vaccum leaks and all good in that department. Tried starting it this am and same problem exists and sevice engine light back on. Any suggestions on where to start the diagnosis.

Not that I am aware of. What would that do and is the temp sensor something that I could do?

OK is this something that I can just replace or check myself because they are saying for me to replace the fuel pump. It lloks as though this part is not very expensive AC Delco part #155632 $4.47 ea.

Rough idle when im warming it up for the first time that day. It lasts for approx. 7 minutes. Im in ny and lately the temp outside has been in the single digits, I was reading the manual and had read something about a plugin heater for the engine, is it good or is it a waste of time and money.

Ok thanks for the great information. Just to clarify you are talking about the intake temperature sensor.

2003 Chevy Tahoe idles rough when outside tempurature is cold. Even after engine comes up to normal operating temp. It only occurs during the winter and clears up in warmer months.
Ideas?

107,000 miles 5.8 liter. Have several issues that may or may not be related. SES light (p0420 code) has been going on and off but the vehicle was running fine. Recently, I noticed a rough idle when A/C compressor comes on. Then today I heard a strange sound when I accererated from a stop. Sounded like a rush of air from under the hood, maybe from passenger side, lasted about one second. Happened four times in one trip to the store.

2001 Tahoe LT 5.3L 156,000 mi.

11/8: In AM, cold start, after driving not even two blocks, idle became very rough, engine was surging and tahoe was lurching forwards, kinda like a dog wanting to pounce on someone. Thought car was running out of gas (gas meter messed up) so filled up a few gallons but engine started after 4 tries (would idle at 500-600 then die). SES light came on, and still stays on

11/8: Afternoon to PM, would start the car in park, and there would be a rough idle, engine surge. Took it out on the freeway a couple times to see if it can still perform on freeway, and noticed SLOW accel. But car would not die. At night, drove on freeway again (3rd try, dist. Of approx. 3 mi.), Going 60-65 mph, RPMs started to fall almost to 0. Stepping on gas did nothing. All of a sudden, RPMs jumped to 2k-3k and stayed like that for abotu 4 sec. Before dropping all the way to 0 and engine dying. After 6 tries (ignition and immediate idle and die) I was able to take it back home (drove in 1st gear w/o mashing on pedal b/c engine would die if pedal was floored). Started car in parking lot, at times idle would be normal and sound ok, and then randomly start sounding rough, engine died 2 out of the 8 times I started/idle it.

11/10-Present: Spray cleaned MAF, poured in Fuel injector cleaner into gas tank, cleaned throttle butterfly/lip. NOW, car will start just fine, RPMs at a little over 1k, then after 5 seconds, drop to 200 and fluctuate btwn 200-900 before dying. 2nd time (at idle this time) that RPMS shot up to btwn 2k-3k and staying like that for a few seconds before dropping again to almost 0. When rough idle, headlights and interior lights flicker. Can't even drive to back it out b/c engine dies so quickly.

Any advice would be great, thanks very much!

Have been having an issue with a rough idle. Started after the truck down shifted going up a hill the rpm's went to about 2700 and started running very rough to the point I could not drive it. The idle is still rough but not as bad as it first was. It is now drive-able. The idle is rough and stays generally down in the 500 to 600 range. I do not notice much of a difference between the idle in park or in gear. There also seems to be a dead spot in the peddle at times while driving where the truck seems to bog and will cough and sputter at times. Have done a tune-up (cap, rotor, plugs, wires, ). The fuel pressure at idle is about 62 was hard to get a perfect reading. Checked for vacuum leaks but have been unable to find any, also when I block off the throttle body air the truck will die immediately. When the issue started I did not get any codes. Also generally at idle or low speeds for a bit the exhaust smells very rich. Cleaned the mass air flow unit and throttle body.