Chknjdn

I did adjust the TPS when I installed it in accordance with the Haynes manual that I have. I looked at the grounds and they are on top of the fresh paint job, so I will take those off and make sure it is a better connection than that. I checked the fuel pressure again. It starts at about 32 psi when the engine is first started, but then slowly falls to around 25 psi. I pulled the vacuum line off the regulator, but it had no effect. As far as the vacuum lines go, they appear to be good, but I have a question. On the back of the carb there is one line that goes to the MAP sensor, but there is another hole there that has no connection nor is is capped. Is this correct? Thanks for the suggestions, sorry for the delayed reply. Chuck

I recently purchased a 1988 Comanche for my daughter to drive and as a project for the two of us. It has been interesting figuring stuff out together. I have been trying to get it to run well enough to teach her how to drive manual transmission. So far, I have replaced the TPS, fuel pressure regulator, fuel filter, and the fuel pump. It has gotten better, but it still doesn't want to run smooth. The idle seems to be at a point that it almost stalls when I don't have my foot on the accelerator, then when I do get it on the road it accelerates normally up to aroudn 2500-3000 rpm area then starts to act as if it isn't getting fuel. It runs rough, bucks and surges, even occasionaly backfires a little. When I am able to get it to go past around 4000 rpm, it smooths out and seems to run like a champ with lots of power. It's just that area inbetween that I can't figure out. Any Suggestions on what could be causing this? Thanks, Chuck