My firebird v6 3,1 goes bad and are weak at high rpms. what I've alredy done: change every gaskets, adjust tps and timing, replace sparkplugs,wires,rotor, distributor cap.

 

its just how the motor stock, to wake it up higher in the rpms u need a cam and ex work,intake work dont hurt either

 

okey, but I meen that between 4 to 5000 rpms the engine doesn't have any power at all.. I have to let the pedal go so its gears, anyway the engine doesn't go clean either. I need some tips that to do . and then you adjusting the tps what idle speed should it be? I come from sweden so sorry for my bad english..

 

Don't mess with the idle or TPS, set them to stock specs. Some basic stuff that you can do is make a free flowing CAI and add headers and exhaust to wake the motor. Setting the timing to 12* is supposed to help also. These motor just have a crappy topend, its the nature of the beast.

 

Mine loses it's power at qround 5K rpm. It usually downshifts before it gets there though, even when I'm getting her going.

 

5k ? that high eh !!!! lol mines crap above 4.5, needs some tweeking me thinks......

 

one of the main reasons it falls on its face around 4500 rpm is the stock exhaust is crap, then the next bottle neck is the intake manifold. we all have this problem. headers and a good catback will help, but the intake is still my problem, even w/ some porting on it.