Have you checked for trouble codes? If not, do so by following the instructions below in the attached Video & The Link Below that explains the meaning of each code.
If if there's no check engine light then it's probably just something basic, I'd suggest checking your air filter to make sure it's not stopped up or severely restricting air flow, clean your throttle body and don't forget to change the fuel filter and do a general tune up every 30,000 miles or so. If these things haven't been done lately, you might want to try those first if you're in a position to right now. Idle Air Control Valves & Throttle Position Sensors can cause this too, a tps isn't always bad, sometimes they're out of adjustment which can be set with a multimeter or volt meter. Also, check thoroughly for Vaccum leaks- use the "carb cleaner" method, if you're not familiar with it a quick google search will let you know. Only do so with safety being priority #1 as with anything, protect yourself and especially your face, eyes, etc. Best of Luck, see the last picture below as well, let me know what you think if you don't mind, have a great day!
FAQ How to read older GM codes for free
Most likely a crank sensor issue.
SOURCE: 1990 GMC Sierra 4x4 1500
the connections near the front axle that activate the motor to engage the system aren't melted? That's a comon problem for that body style. If there good, sounds like it could be that motor itself. To figure out if it's you motor or transfercase, jack up the rear end, have a friend inside shift into 4 wheel drive, or try to, and put it in gear and apply some gas. If the front driveshaft is turning then it's something with the front end. If not, farther back in the system.
SOURCE: 2004 gmc sierra
give it a complete tune up and change the fuel filter if that does fix it then check for a vapor lock and bad fuel pressure regulator
SOURCE: My problem is my 1990 GMC Sierra was running then
You need to do a fuel pressure test on it. You also need to test the injectors w/a noid light to see if you have pulse to the injectors.
SOURCE: 1990 GMC Sierra 1500 pickup. Windshield wipers, Cruise Control
May want to look at replacing the wiper circuit board.It is located on the firewall adjacent to the wiper motor and has a some what square black cover with 3 torx screws and wireing harness pluged into the side.We had a truck that every time you washed it the wipers would stay on until it dryed out.You can try removing it and spaying it down with contact cleaner just watch the brease on the two contact tips.Well hope this helps.
SOURCE: My gas gausge doesnt work in my 89 gmc sierra. How
If all your other gauges work, more than likely you have a bad sending unit in the gas tank or bad ground to the sending unit.
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