Did a search but did not find anything.
The 90 GTS was running like crap so I did a tune up.: new wires,plugs, dist cap,air filter,and rotor button. Now the laser on my radar detector goes crazy above 3K RPM.

Also boggyness is better but not gone,still wants to hesitate and makes a chugging sound from exhaust at idle.Any Ideas?
Fuel filter and checking for plugged cat are next.
Gotta get her running right before I start mods. Also noticed the 5th injector. How much boost can I lay on the 2.2 DOHC engine's stock internals if I trigger the 5th injector?
I've made good power with the Ford 2.3 Turbo,but the Toyota performance thing is new to me. Help!