new 90 gs runs rough

[robb90gs]

i just recently bought an 90 gs... only problem im having is when it warms up it runs ruff like itll start to rev high then bog right back down ive done a tune up new plugs wires oil fliter air filter check the fule filter everything is good any ideas ?

 

[swilk]

I've got a pretty similar problem. I've got a 93 LS swap in mine though but still obd-0. I'll let you know If i find anything you can try. But for now try cleaning the IACV and your FITV. That can cause a little idle trouble.

 

[da9 b20 beast]

check you pcv and your tps ....problem my be bad tps though

 

[treybombRW]

for mine it was a main fuel relay. i replaced mine with a newer version. the stock main fuel relay is an rz-0067 and the better replacement is an rz-0063. 50$ part well worth the money.