im noticing at high rpms under load, my tps signal seems to fluctuate, and the car bucks. this only occurs over 3500 rpms.

any ideas? this is a tps that previously worked wonderfully.

 

At high rpms, the TPS signal is maxed out. If it's fluctuating (as can be seen from a meter connected to the ECU pin), then the TPS is bad. If not, you've got another problem entirely...

 

^

Since you mention 3500 RPM, you're also in the range of the famous "3800 RPM hesitation" - the stock tach is, eh, a bit inaccurate at times.

-=Russ=-

 

also your aux. ports might not be oppening alll the way or not opening at all. cuz they do tend to open between 3500 and 4000 rpm.

 

Aux ports not opening won't cause bucking. When they're closed, the engine smoothly pulls up through about 6500 RPM - it'll wind to 8, but it doesn't have a lot of power.

When they're open, you have no torque below about 3000 RPM, and then around 5000 RPM you feel a bit of a surge, and the engine pulls hard up through 7500-8000 RPM.

-=Russ=-

 

k.. once again.. this is why im weirded out,

the car pulls normally to 3500, at 3500 i get a massive hesitation and the car surges up to redline. on my safc, i can see the tps signal drop to 99.7% throttle as this happens.

this only happens when the secondaries are on however.