GT06GT

i had a similar problem to you 4 days after i bought the car, but my car was throwing codes and i didnt dare try it at WoT, but it turns out I had snapped 1 of the valve springs in the #3 cylinder, It was very noticeable though, probably not it but i figured id mention it since no one said anything

A_J

Hey, ya never know.. so along those lines TheLowsters, any unusual noises from the engine, such as valve ticking, etc.? The shaking of the car may indicate a cylinder(s) misfiring..

TheLowsters

I don't hear any strange noises, Im wondering if it could just be like the MAF or TB going bad. If there was something mechanically wrong with the engine I would think it would run strangely all the time. But its pretty normal just cruising. I could try and load the 87 tune since it has a lower octane it wouldnt be as rich.

TheLowsters

Well I took off the C&L, installed my K&N intake and put the stock tune back on. Seemed normal I had 1/4 91 octane so I filled the rest up with 87. Tried WOT a few times, seemed fine. The last time I did WOT I stopped to check and see if everything was ok. Idled for a bit then I got a strong fuel smell and it threw a code. P0171 sys too lean 1. I cleared the code and drove home slowly with no problems. Could this be related to the magnaflow cats or maybe my fuel filter or something?

moosestang

How do you snap a valve spring and I haven't broken anything? Was this after you brenspeed tune? Just thinking maybe you rev'd it to high. I hit 7k on a missed shift with my brenspeed tune, scared me straight. I can't get much over 6200 with the whipple before it starts killing the power.

SirKnightTG

Do you have your rev-limiter turned off?

TheLowsters

Since there was a fire Im hoping my MAF just got messed up/Dirty. The code wasn't triggered just cruising around. Do you think my dealership will give me a hard time about the x-pipe and magnaflow catts? They didnt mind my pullies and K&N when I had those on and went in for some work.