Runs rough and sometimes shuts off

I don't have a way to monitor that, but it was under warranty and they gave me the run around and said that I told them it was misfiring and that was it so they "fixed" it and didn't check for anything else. Normally if it was a vacuum leak you could spray brake cleaner and find the leak with the engine revving up right? Honestly I have just been trying to figure it out because it's bugging me and I need a good running truck. Thanks for the input. I am going to put a scanner on it today and see if there is any codes that pop up even though the light isn't on.

They never told me they did a compression check, so I am not sure if they did or not. But I might be able to get one done soon.

I'm going to try to run a compression test on it when I get home tonight and I will let you know what the PSI is on each one.

I was going to do the compression test and I took one plug out and had oil all over the threads so hopefully it should be covered under the 5 year 60,000 miles power-train warranty. I'm just going to let the dealer figure it out and save me some trouble.

I tried that last time and they said they didn't have any and couldn't get me one.

Changed out bank 1 camshaft and one follower. Also changed spark plugs and coils. I also changed both VCT solenoids. When I put the cam phaser back on I measured the gap between the phaser sprocket and the front cam cap and it measured 18mm which is the correct measurement. Now when running the engine it has a rough idle and check engine light has come on. Scanned the engine and found the following codes, P0022, PO303, P2007, P2006, P0300, P0341. I disconnected the VCT solenoids but it still has a rough idle have you any idea? I might add that the engine ran fine but I thought the VCT solenoids were faulty. The cam shaft needed changing cause I heard a tapping coming from bank 1 I pulled the valve cover and found number one cylinder exhaust follower had stopped working and wiped the lobe on the cam. What are your thoughts?

I have a 2006 ford f150 4x4 with an automatic transmission. On my way to town tonight, it ran fine for the first 8 miles or so, then, as soon as I got to the first stop light, I noticed some serious vibration while idling. I went through the light and pulled into a parking lot where I could assess the situation better. It was idling at approx 500rpm, and seeming to be running on several of the 8 cylinders. My "check engine" light began flashing as well. I revved up the engine to see if it would clear up, and it seemed to, so I continued driving, as I only had another mile or two to go. Power was 80% gone, struggling to accelerate, with a crazy vibration throughout the pickup. I also noticed a smell in the cab that smelled like a cars' exhaust in the cold morning ( like it's burning rich or something ), or something sweet like. Before I made it to my destination, I stopped again to try and give it a break, crutching my way. I let is sit for 5 minutes, then attempted to start it. It took a lot of cranks to fire up (10 seconds ), but it did. I got to my destination and shut it off. Its dark, and Im not a mechanic, so any suggestions? I'm what you'd call "concerned". Thank You!

I had a similar problem with my 4.2 v6. You would do weill to relpace the spark plugs. My number four cylinder was buring (literally eating up the electrode) up plugs way before the other cylinders. I don't know why, especially when my wires were fairly new. Check your plugs--it will probably the cheapest repair you'll ever make! Be sure to replace with OEM quality or better!

Took it to a mechanic this morning and he diagnosed it. It ended up being the PCM (computer) malfunctioning, keeping cylinders 2, 3, and 4 from firing. Thankfully fords have a 8 year / 80,000 mile warranty on the PCM, so I'm in the clear! Oh, and the rich sweet smell I smelled was unburnt fuel from those cylinders that weren't firing, all coming out of the exhaust.

When you said sweet smell, well I knew that was unburnt hydrocarbons / fuel! It is amazing it still ran at all. I am glad you resolved your issue.

I have a 2005 f-150 with 3.5 engine I got a code po352 ignition coil b primary/ secondary circuit malfunction what could cause this it run rough and have no power run good when you fist start it up