mainly to happen in 3rd at 4000 rpms. 1st gear has no power i believe to be starting at 3000rpms. and when doing 55 5th gear sucks for bauging down on me. injectors issue? i have had vacuum issues so could a switched vacuum line do it?

88-na-

thanks guys,
jeremy

 

Could be a few things. Could be a bad ECU ground/secondary injector problems. Could be port issues. I'm no much use with the port control on an NA car, so someone else will have to chime in on that one.

 

3-4k RPMs is the injector staging area, where the fuel system integrity is the most important.

check fuel pressure at idle and at the 3-4k RPM area where the issue occurs, if it is low check the voltage at the pump(black/white wire to the top of the pump housing)
replace the fuel filter
clean and service the injectors
clean and re-ground the engine(the main injector ground circuit junction is at the rear rotor housing bolted to the housing itself). make sure the ground at the starter bolt and the one on top of the transmission bellhousing are solid and clean as well.