Check engine Light

Hi
The check engine lite in my 1998 Explorer came on a few days ago and is still on. What worries me is in Sept. The light came on and I took it to Ford and they said the cam shaft sensor needed replacing, so I had it replaced. I thought my worrries were over. Now the light is on again. Last week before the light came on I had the oil changed, transmission fluid changed and coolant changed. My vehicle needs its first tune up at 100,000 miles, I am wondering could this be why the light is on?

Hard starting, rough idle, hesitation at acceleration, idler pulley at top left not turning just rubbing on belt.

Driving down the road engine started sputtering, only at cretain speeds, check engine light came on. Seemed to come and go-i did make it home. Where do I start?

Was just driving down the road and a check engine light came on.

The problem I'm having is that at lower RPMs, the engine runs rough, and it doesn't matter if it's in gear or at idle. I'm not much use on the newer vehicles, but it acts like it has a fouled spark plug, but whatever it is causes the "Check Engine" light to come on, and sometimes flash. I've had two AutoZones and a Jiffy Lube try to connect to the computer port under the dash, but their hand held devices aren't producing any codes. After doing some checking, I've been told that it's a possible coil pack issue, but I wanted to make sure before I just start replaces parts.

Thanks for the help!

This is easy. Cuz u were barking at the wrong tree. Engine driveability and perfomance emission is my specialty.I'm an L1 tech. No sweat. Lets try the easy thing 1st. Lets understand what trigger the chk eng lite.
When the chk eng lite come on. Make sure it stay on or don't cut off ur engine before some1 scan it.U might have a bad grd or pwr that kept wiping out the memory code after u turn it off. Try this 1st.
NOW. If u still can't get a code on generic OBD2 code reader. That means it is a factory code.U gonna need a real mechanic. Opsssed I shouda say real tech with either a ford factory scan tool or after market like a snap on- modis, solus or OTC genisys which are capable to extract factory code.
Get the code and let me know. Then we go from there.
BY government rules. If ur chk engine lite come on. All manufacture ECM must be able to STORE A CODE. Get more detail on OBD2 codes and system on internet b4 u listen to parts guy or lube tech. Let me know and good luck man

Hello I am truly frustrated with this light! I have changed coil packs, spark plugs, o2 sensors, air filter, cleaned the intake and flushed and cleaned the injectors I am in desperate need of an answer PLEASE HELP!
I got the vehicle scanned and it is telling me BANK 1 IS RUNNING LEIN. What can I do to resolve this problem?
JOSH MORRISON

I did reset the light it did come back on I just repalace my K & N filter back to a paper filter hopefully that will resolve the problem. I did start having problems when I switched it out also the K & N did not sit well inside the housing I will let you know in a day or two