This is what happened to my car. I have the following modds, AMS Stages 1-4 and a tune. All of a sudden my car is misfiring. what is really strange about it is that it does it all the time and at 3k rpms and above. It feels like there are two cylinders dropping off. I changed my spark plugs and it did not help it. I changed the coils and no change. Oil change and no change. Flash and same thing. What can it be? Can someone please help?

 

This may be a dumb question but is your MAF plug plugged in? I would also do a boost leak test because if you have one big enough it will cause an issue like this. Good luck and keep us updated.

 

Will you give us more details, please? Is this a high speed miss? At what RPM are you experiencing this condition? At what throttle position does it happen? Is there constant sputtering and hesitation? For the benefit of the uninitiated, will you please spell out the list of mods in your AMS stage package.

 

Is the ECU throwing any codes? That would be a great place to start.
What do the plugs look like?

But from what you've said, I would:
1. Check the timing.
2. Do a boost leak check.
3. Do a compression check.
4. Do a leakdown check.

 

Do you have magnacore wires?

 

I've seen a set of factory wires go bad after someone washed their engine bay for H.I.N. Did you leave the old wires on when changing coils?

 

_ceteuro your right down the street from me actually. If you don't get it figured out and don't have a chance to stop by the shop, shoot me a P.M. I'd be happy to go for a ride and maybe get an idea of whats going on.