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For a 5.7 liter v8 distributor cap firing order what is the correct placement for plug wires on I of cylinders 88 Pontiac trans am?

The firing order for a 1988 Pontiac Trans Am with a 5.7L V8 (likely a TBI model, but it could be a TPI depending on the exact trim) is 1-8-7-2-6-5-4-3.

Therefore, the correct distributor cap wire placement would be in that order, starting with cylinder #1. Remember that the distributor cap's rotor spins, so the wires are numbered sequentially as the rotor passes them. You'll need to identify cylinder #1 (usually the front passenger side) to get the rest right. A diagram specific to your engine is highly recommended, as there might be slight variations depending on the exact year and engine code. Your owner's manual or a reliable online resource (like a specific year/model repair manual) would be the most accurate source.