Hello everyone. I have a 1990 Hf, I have a hesitation from idle to about 2500 rpm under a load (and only under a load). This is what I have done and checked out: Major tune up including NGK plugs, honda wires, cap, rotor, pcv, fuel filter, air filter, injector cleaner, timed the engine. I unplugged the tps and the car run smoothly, smogged it the other day and it failed on both HC and CO. I was told it could be the tps, but I am wondering if it could also be the ecu or tps wiring to ecu. Also, why would the car run smoothly with the tps unplugged. Thanks for any help you can provide.