Ok, so my truck has been stuttering for a while the check engine light comes on and it's either bank 1 too lean or cylinder 1 missfire. It's a 1998 4.6L with 113,000 miles. I have replaced the Plugs, wires, and PVC valve @90,000 (no problem after replacement), coil packs, and oxygen sensors within the last week. I have cleaned the Idle air control valve, cleaned the TB, and cleaned the MAF Sensor (with the plastic safe sensitive electronic QD cleaner). Only thing I haven't done is replace or clean the EGR valve. Any ideas? I'm starting to get really frustrated and might have to give in and take it to my Ford dealer. Thanks,

Brittain

 

Did you try running some fuel injector cleaner with your gas?

 

my other truck had this problem stuttering during traffic, supposedly quick lube never changed my Fuel filter and the intank fuel pump couldn't handle it anymore and finally died, but i did the exact same thing everyone was saying, check your maf sensors, your pvc vavles, your intakes, run fuel injector cleaner,your blah bl blah bl blah.... the whole time it was the fuel pump going out. theres no way to tell if your fuel pump goes out til it does.