misfire

Had a CEL on for misfire cyl 4. Replaced all 8 plugs and cyl 4 coil. Reset engine light. Been driving it a bit since then. Now in 4th gear ONLY the CEL flashes, shift to 5th and it goes away. I don’t know what the hell is going on. Weird. 2002 Mustang GT. 4.6 with SLP Long Tube Headers, Cats are...

Hello all, as seen in the title I have a 2000 mustang GT 4.6 throwing misfire codes for cylinders 1 and 5. Was driving fine and went to start up one day to a rough idle and terrible acceleration. Took a look and did the old test of unplugging other cylinder wires to troubleshoot. Found 1 and 5...

99 GT, Sean Hyland cams, Kenne Bell 1.7. First a little background..I just finished replacing the front engine/timing cover. (long story) but it had an SCT timing adjuster that I removed and simply plugged in the crank sensor. Started the car. It's missing at least one cylinder and is dumping...

This is my first post on here but, after reading everything on this forum for help in the past, I've finally decided to reach out for some input on what could be causing the problems I'm having with my 2000 GT. For starters, I've learned a lot about my car over the last two months, I've...

In between 1600 and 3000 rpm the engine is misfiring, it starts sputtering and has a rough time getting through that range. I have checked the fuel pressure and combustion on each cylinder, got new spark plugs for it because i thought that could be it. Any ideas on what it could be? it is a...

I bought a 2005 Mustang V6 cheap. After getting home with it, I found out why - the block was cracked. Luckily, I found a replacement with only 23k Miles. The tag on the replacement says it was an '06 model. The wiring harness connected to everything just fine, EXCEPT for the 3rd connector on...

Hey everyone, so my car has been acting up recently and i can't seem to pin point what the problem is. When the car is warm it stumbles over itself and misfires badly when given any throttle. And the weird thing is it comes and goes when the engine is warm, it will do it for a few miles and them...

I have a 94 cobra pace car pretty much bone stock. Just swapped out to the gt40x heads and now have a horrible misfire. Barely runs . I changed all the plugs gapped at .042, wires, cap and rotor. I also changed the injectors while I was at it. Any ideas? Not much for diagnosing these things

Hey guys, just joined the forums and I'm hoping someone can help me fix my problem. Ill start with the previous week before this started. Finally had my car running great after I did the head gaskets. I was driving along and the roads were pretty bad and I went through a big puddle. A few...

Ok I need your help guys..i've done everything i've known to do. So here goes: my 95 Mustang is completely stock except for a cold air intake system and I had the two catalytic converters furthest from the engine removed to make the car louder and that is it. Now heres the problem-my car would...