backfire under wide open throttle

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Sad Sack

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Joined
Sep 3, 2024
Posts
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Location
Omaha, NE
First Name
Goober
Truck Year
1985
Truck Model
C15
Engine Size
305
If no spark, remove the dist cap and make sure rotor is turning. Test ignition module at your nearest autoparts store. Rare when coils fail but they do and are fairly cheap so swapping coil out may be something to try. Then dead-time the engine using TDC technique and confirm wires are correct for each cylinder. Report back.
 

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