car miss firing????

[Alexfriday]

when i shift into forth gear and try to punch it my car doesn't go, it just goes then slows and goes again(like a jack rabbit) any answers i was thinking of replacing the wiring to the coils cut the heat from the exhaust has kinda baked them

[Detroiter]

When was the last time you changed your spark plugs? When I first changed my tune to stage 1+ the added boost kept causing the spark plugs to break up resulting in rapid misfiring. Once I replaced them with some new ones it solved the problem.

[imnuts]

What codes are stored on the ECU?

[Alexfriday]

I've replaced the plugs and the coils and my code reader isn't picking anything up yet
also i replaced the this jet suction pump like a month ago ? maybe its bad?
I've heard that replacing the coil wires might help because the plastic connection to the coils are falling apart

[Alexfriday]

i also replaced this air pump check valve and to be honest idk if i put the darn thing in the right way but I'm like 70% that i did tho ... :/

[ECS Tuning-Audi]

Have you checked for boost/vacuum leaks? A leak can definitely cause misfiring. Do you have a boost gauge installed? If so have you noticed a drop off in boost pressure?

Jason

[Alexfriday]

i don't have have a boost gauge how els could i check it?

[imnuts]

If you don't have any stored codes on the ECU, then the car is likely not misfiring. Does the CEL blink when this happens? Also auto or manual?

Sent from my DROID Turbo 2

[Alexfriday]

If you don't have any stored codes on the ECU, then the car is likely not misfiring. Does the CEL blink when this happens? Also auto or manual?

Sent from my DROID Turbo 2

Ok so the code that popped up is P0442 evaporative emission system leak (small) but I don't know if that has anything to do with the missfire

[imnuts]

If there was a misfire, you should have a code for the misfire. So far, I haven't seen anything to suggest you have a misfire either. Does the car shake when this happens? Is it only in one gear, or all of them?

Sent from my DROID Turbo 2

[Alexfriday]

its mainly in 4th gear but it happens in 3rd sometimes

[imnuts]

Are you sure it isn't a transmission issue?

Sent from my DROID Turbo 2