Help please, Engine miss

[RRev Tim]

Well, if anyone has some suggestions I would appriciate it

My 87 GN has a misfire at partial throttle. On the freeway in OD it does it about 2250 rpms. City driving it seems to do it at about 20% throttle. At full throttle is runs great, just under slight throttle. I just replace the ignition module, coil, plugs and wires and it is STILL there. My next guess was going to be a TPS sensor. Anyways, if anyone can help before I spend more $$ I dont need to I would really appriciate it.

thanks
Tim

 

[SouthernCal GN]

Tps

 

[RRev Tim]

Does anyone think it could be a crank sensor issue?? Seems like that is another suggestion I have found for missfire.

 

[RRev Tim]

BWT, No check engine light either, if that helps....

 

[RRev Tim]

OK, Just did new TPS and calibrated it to .44 at idle and 4.65 at WOT. STILL HAS A MISS. Can anyone help???

 

[terrible-T]

Are all of the bolts tight to the Intake manifold/ Intake plentum . Vacuum leak?

 

[BW Jones]

miss

scanner numbers and fuel pressure data would be helpful. a reliable scan tool is a must for diagnosing driveability isssues. let us know further info.
bw jones

 

[Underboost]

Tps

What you said

Theres a flat spot on the sweep.