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: 1988 chevy pickup 4.3 V6 that has constant backfire
bad dis cap or rotor maby a bad plug wire or valve sticking or out of adjusment
SOURCE: What is the distributor timing mark for 89 chevy
Is the vacuum hose removed from the dist when the timing is being checked?
Are you connected to the first plug wire (closest to the rad) on the drivers side?
If this is being done.....remove the cap and rotor and check the springs on the mechanical advance,the advance should be tight to the shaft and springs tight.
I would set the base timing on this set up .....at idle speed...... at between 5 and 10 before TDC.
Remember......timing marks on modified engines are not always accurate. Parts from this year and that year put together.
SOURCE: i have a 2001 chevy camaro v6 3800 i here a
check you idler and tensioner pully also water pump could be going bad
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