Trstrugar
OBS Enthusiast
My truck is a 1994 GMC z71 1500 with a 5.7l and 700r4 tran. I am having low idle problems. The truck runs great when it's cold and first started up, voltage is at 14 and it idles normal. when in drive it will idle low, around 200. It gets worse after driving for about 20 minutes and it is fully warmed up. Voltage will be a little erratic, around 12/12.5. Idle will surge a little bit and when stopped and in drive will struggle to not stall, will stay around 100 Rpms. Also the check engine light will come on after it's been running a while. The only code I have been able to pull is a 44 o2 sensor. Plugs and wires look good, coolant temp sensor looks new, along with IAC valve, map sensor, and wiring to both. EGR looks pretty old so I haven't entirely ruled this out. I know I had a thread about this before but I never figured it out and the thread was pretty old. Any help is appreciated thank you!