i have a 1995 gms c1500 suburban and it was running fine with no problems at all untill a few days ago i started it up and the idle jumped right up to 1500 and kinda bogged down. now i start it up and it tries to get the idle to 1500 but bogs down really bad and dies. i tried to buy a ogb scanner but they said they dont have one that will work on my 95 so idk where to start or what to try. anything will help.
thank you

 

vacuum lines all ok? check to make sure the throttle body is clean and the plate opens/closes freely

 

Here is a great "how to" on reading the codes for pre 1996 vehicles

How to read older GM OBD diagnostic codes for free




FAQ: How to read older GM codes for free

If you own a 1982 to 1995 GM car or truck, you just might be able to read your trouble codes for free! If you have a connector like this under your dash, read on... (note: this connector may have a black plastic cover over it.


This is referred to as the Assembly Line Communication Link (ALDL) connector.

How to read the codes

Ground terminals A and B (see diagram below) with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a Code 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession.
After Code 12 is displayed, any stored trouble codes will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All codes are displayed 3 times each then a code 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids.
ALDL Diagnostics Connector (Located Underdash)