1991 chevy pickup v-8 engine

SOURCE: 1991 chevy s10 pickup 4.3 engine

Check for vac. leaks and timing.

SOURCE: 1989 Chevy K2500 - idles fine but stalls out when put into drive.

Sounds like the injectors may be bad or just really dirty. You say that the truck is only used as a plow truck, so I would assume that it sits alot. If you dont add any fuel stabilizer to the tank, the fuel will start to degrade and the will gum up your injectors. One thing you can do is to pull the air cleaner assembly off and look at the injectors while the truck is running. Look at the bottom of the injectors while it is running. The injectors shouldbe spraying fuel with a fan spray of fine mist. If you see any drips of fuel in the this fine mist, that injector is at least dirty or on its way out. I would recommend that you change your fuel filter and then get some fresh fuel and the purchase some Seafoam fuel injector cleaner from your local parts store. Dont mess around with anything else. GET SEAFOAM. If it is in a plastic bottle it is not strong enough to do anything. Seafoam is in a metal can. Dump the seafoam in and run the truck as much as you can. This will help clean out the injectors.

SOURCE: engine stalls when put into gear, idle fines in park

This is a comon problem with GM cars.Most likely cause is the torqe converter clutch lock up solenoid.

SOURCE: 1993 1500 Chevy Pickup stalls at stops and when I crank the wheel

idle control valve or vacum leak

SOURCE: 1992 Chevy S-10 Pickup 4.3L 6 Cyl. Engine sputters

SOUNDS LIKE MAYBE FUEL FILTER NEEDS REPLACE, AND OR EVEN SPARK PLUGS AND WIRES. A GOOD TUNE UP. IF YOU RUN LOW OCTANE FUEL YOU MAY TRY A CAN OF OCTANE BOOST, OBTAINED THRU THGE LOCAL PARTS STORE, IN WITH THE NEXT FILL UP. IT WOULD PROB BE A GOOD IDEA TO GET SOME INJECTOR CLEANER AND PUT IT IN WITH YOUR GAS TO SEE IF THAT HELPS.

Testimonial: "I put in injector cleaner and gas boost. No help. Will replace fuel filter. Could bad oxygen sensor cause this?"