Marcos Beltran
OBS Enthusiast
I have a 95 stepside V6, 4.3 liter TBI that im having some weird issue going on. About a year ago i had a problem when pressing the gas the the trucks rpm would raise up but the truck would not accelerate. Replaced TPS and fixed rhe problem. Well the same thing happened about 2 weeks ago and replaced the TPS cause it was under warranty and worked for a week and happened again. This time though it seemed to bog down and the idle would fluctuate. Cleaned the IAC cause it was dirty and it drove really smooth for about 25 to 30 minutes and problem came back. Replaced map sensor with a known working one and worked again for 25 to 30 minutes and problem came back. It seems like it has a vacuum leak but there isnt any and i would think that the vacuum leak would be there once you turn on the truck not 30 minutes later. So i started to suspect that it seems to start having problems once the truck is fully warmed up. So i suspected maybe my egr valve is bad. So i took it off and realized the the egr valve was stuck and would not move in and out like its supposed to. So i replaced it and the truck ran really good, i mean beautifully smooth, best its ever ran, but then 30 minutes later the problem came back. Now the only other thing that i can think of that works off of tempurature is the temperature switch. Could this be causing the issues? Its got spark plugs, wires, dist cap that are abiut 6 months old so thats not the problem. What about the EGR valve solenoid?