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check if fire at the end of spark plug wire with HEI spark plug tester.It need 25000 volts to jump the tester. If ok check for fuel injectors by pouring a little fuel inside intake .
their are two spark control features one is the pick up coil it's mounted under the distributor the other is in the distributor it the control module check the pink wire that plugs into the distributor for power
I would check the rotor very carefully. They tend to burn a hole through the plastic under the center tab. It's hard to see sometimes. The spark follows that path instead of to the wire terminals. You may just want to try a new distributor cap and rotor.
I'd check for vacuum leaks next. use a spray can of intake or brake cleaner. spray around vacuum lines, manifold gaskets etc. if the rpm increases you found a leak.
Check fuel pressure and check for spark and check that the airflow meter is operating, check for timing as well. Check for any wiring problems(loose connections, corrosion, condensation in distributor cap. Check distributor cap+rotor plug wire from coil to distributor. Check for any worn or damaged wiring or bad ground wire contacts. Air, Fuel, Spark and Timing are the key elements for an engine to run.
Ok First lets check the spark. Go in Steps first check to see if you have spark from the ignition coil TO the distributor cap by carefully pulling the coil wire out of the distributor cap, always grab by the boot not the wire never by the wire and wtist gently and pull slowly . once out hold the coil wire close to a ground and have someone crank the engine you will be ok as long as you do not put your hand over the end of the coil wire! Ok if there is Spark there Great, now reinstall the coil wire in the cap. Now go to a spark plug wire and do the same procedure but the plug wires are a bit different on the plug end than the coil wire so you may ned to put a phillips screwdriver in the end of the wire and hold the screwdriver close to a ground be careful of any moving parts like the fan! If you hve spark Great if not you need a distributor cap and rotor (USE ONLY FACTORY GM PARTS) it's very very common in the Astro van
First do these tests and get back to me at [email protected] and we'll move on to the next step if we need to. www.aceautomotive1.com If this information is helpful please give me a fixya! Rating Thank you, Randy
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