checking the timing
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Car: 1988 GTA
Engine: 5.0 TPI
Transmission: T5
Axle/Gears: 9 Bolt, 3.45
Re: checking the timing
Also, you need to unplug the ECM timing advance wire, to get accurate timing at idle. It's a one-wire plug, tan wire if I remember correctly, and it should be sticking out of the wire harness near the A/C blower box. This will keep the ECM from adjusting timing, similar to unplugging the vacuum advance on an old school distributor.
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