Can someone please help me! My truck, for the last 3 months, has been giving me fits. When I start it in the morning it runs about 1400 RPMs then after 8 seconds drops down to about 400-800 runs really rough ,has died, then starts back up and runs fine. Sometimes it runs fine after I restart it sometimes it doesnt. It shows pending codes PO353 and PO357 everytime and sometimes has up to five of these codes at once. Ive taken apart the coil pack harness and cleaned, replaced all spark plugs again, changed all COPs and tested them again all within range, and put dielectric grease on all boots. I dont know what is causing this and have no idea where to go next. Any ideas, help, or theories would be greatly appreciated. Thanks

 

what kind of truck you got ...what size motor...and the specs on the truck

 

Sorry about that! Its a 2000 Ford F150 5.4...auto. thats all I know as far as specs.

 

Well maybe a dirty IAC or MAF. What do the codes bring up as the error? And you dont put dielectric on the threads of the bolts you put it all over the boot and COP tip

 

Ive cleaned the MAF twice didnt make a difference, gonna clean the IAC this weekend. I put the dieelectric grease on the connectors, and tip of COPs. The codes are P0357 primary/secondary circuit malfunction

 

a circuit malfunction is probly not going to be the cops or spark plug it's something in the computer or with your firing you Ned to dig deeper and find out what it actually means

 

Anyone help? Ive gotten P0357 and P0353 codes 2 days in a row morning and afternoon after truck has sat for a while. Swapped injectors this weekend didnt help, have swapped around coil packs no help, cleaned MAF, replaced fuel filter, cleaned harness pins from PCM to coils nothing has helped, anyone had anything similar? Could really use some help!!!!!!

 

Hmm, sounds like a rough one. Sorry I don't have any advice, but I'll give you a free bump, hope you figure this out, I know how hard unknown problems can be.

 

DTC P0357: No. 4 Cylinder Front Ignition Coil Circuit Malfunction
DTC P0353: No. 2 Cylinder Front Ignition Coil Circuit Malfunction

check the connections maybe.... wish i could help more

 

Changed COPs 3 and 7 codes went away, but now Im getting P0354 and P0358! Does anyone know why that would happen? Is it just the Autozone COPs?