I recenlty started to notice my car has a really bad surge when I rev the car beyond 5500rpms while in park. I normaly don't make a habbit of reving my car in park, but I have had a backfire issue. I can run up to a 100 shot with no problem. If I run the 150 shot, my car backfires once I hit 5000+ rpms. The car never has had any issues till recenlty with no new items put on the car & or no new issues..............till now!

Replaced cap, rotor, plugs, module.

 

"If I run the 150 shot, my car backfires once I hit 5000+ rpms."

Nos is an oxygenator, you need a bunch more fuel to run a 150 shot.

Save your money up for a new motor. You are running the motor lean, it will literally melt the pistons.

 

No, I think it's rich. I'm getting popping out the exhaust, no detonation. If I were getting detonation, then, yes, I would suspect its running lean. My plugs are rich. I see raw fuel out the exhaust when I have the backfire..or I should say afterfire. Timing is @ 6 advanced, plugs @ .35.

 

Well, my car has a surge and backfire with out using the n2o. I get a surge @ 5500rpms and occasional backfire?

What would cause a miss @ high rpms and a backfire?

 

Ignition breakup or valves floating.