With the tan/black timing wire disconnected, with engine idling and warm, ignition timing should be set to 0 degrees.
At what degree do I set my timing for a 1985 GMC s15 pick-up truck?
Vacuum hose diagram 1988 gmc s15 2.5
on the engine look around you will find it
Owners manual (available for download online) says 190 horsepower
Could be starter.
How do you install an alternator belt on a 1986 GMC s15 pickup truck
You can find the firing order right on of the intake maifold on most all GM cars and trucks.
it has around 100 hp