'90 3.9L V-6.

severe hesitation, bogging upon throttle application.

Won't get over 1200 rpm in gear, 2000rpm in neutral. Appears the ECU is dumping way too much fuel into the engine - running rich.

Starts and idles fine.

Any ideas?

Replaced cap, rotor, wires, and plugs 20k ago. Cap, rotor, wires look good, havent' pulled plugs yet.

thanks,
Evan

 

Mine did this when the EGR valve got stuck open. I'm not familiar with a 90 setup though. Check it if you have one.