Hey Scotty, I have a 1993 Honda Del Sol 5 speed with 200k Miles & a straight pipe exhaust on it. After warming up the car, I push down on the throttle, while in neutral, and as I slowly accelerate the RPMs up the stick tends to hesitate and drop a little. The car tends to jerk really hard for a second when I start to drive but stops doing it after driving for a few min. I've changed the spark plugs, tps, IAC valve, air filter, distributor, and even the fuel pump relay because it takes a few seconds before it engages. I've checked the fuel injectors, and they all pulsate consistently but I'm unsure if they are weak or dirty. Is this a misfire from fuel issues like bad injectors? Only thing I have not changed are the spark plug wires, but this seems like a fuel issue.
Sounds like a fuel pump and filter issue. How old is the fuel filter?
I just replaced it about 2 months ago. If i could post a video of it i would cause im unsure at this point.
If you replaced the fuel pump relay with no results the next logical step is the nearly 30 year old fuel pump. Can you do a pressure test on the pump to verify its function?
I ended up changing the fuel pump and sock filter on it and the old one looked burnt out blue. Now, still having the same issue. After a rainy or moist air kind of day, it still takes a min for it to prime, and the rpm still hesitates. I'm considering a bad ECU because I get no codes but when I jump the plug with a paperclip, I get Code 14 for the IAC/Bad Ecu. I've recalibrated the IAC based off the Haynes manual Instructions and still get the same code. Im going to take out the ecu and open it up and go from there. I'll keep you posted, appreciate your help on this.