[jacobrook22]

Ok. here is the deal I have a 1995 Chevrolet C1500 305/5.0LTBI. My problem is that once I go out in the morning after it sits all night i start and it idles at 600-700. Then once it runs for 2-3 minutes the idle shoots up to 1600-1900. I have replaced the following
-Vacuum lines
-EGR Valve an Solenoid
-MAP Sensor
- Idle Air control
-Coolant Temp Sensor
- Throttle Body Gasket
- 02 Sensor
Literally everything but the intake manifold gasket, sure i left some parts out!!
Dear god please someone have some advice. I'm running out of options, money and patients with this thing.
Could it possibly be my timing??
1995 Chevy C1500 305TBI

 

[00silvyON]

Does wet conditions/rain make a difference in the idle speed? If you start it up in the morning and give it a small shot of gas to say 2000 rpm, does it come back down?

Normally my truck cold revs about 900-1100 rpm, and about 30-60 seconds later it comes down to 600-700 once the motor is warm(ish).

Does your throttle body close/actuate all the way properly? throttle cable not kinked and working properly?

 

[jacobrook22]

Well, I think after actually discovered the problem after 2 months. I checked the timing yesterday and it seems to be off. Could this cause high idle? Either way i gotta go buy a timing light.
And yes all that is good, I have checked EVERYTHING