94 5.7L TBI stumbling

[thunderstruck]

Put an inline spark tester between your coil and cap and see if you're losing spark while it's acting up at idle.

 

[GMC1994K1500SierraSL]

I'm 3.5 hours away from home, and it's a long weekend, a small shop managed to squeeze me in tomorrow at 12, said they'll do some tests, tell me what's wrong and go from there


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[GMC1994K1500SierraSL]

Where could I buy one? From a parts place? Just incase I need to do it myself


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[thunderstruck]

A parts store might have one.

Did you ever do the tune up mentioned early in the thread? I really think it's the ignition coil.

 

[GMC1994K1500SierraSL]

Parts places are all closed here but I got plugs and wires, maybe if I'm lucky a napa will be open and have an ignition coil


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[GMC1994K1500SierraSL]

Pulled all my wires off and inspected them all found a few like this

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Rusty on the inside

Pulled the coil wire off and found the centre contact to be very corroded

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Inside the distributor was surprisingly beat up for only being 10,000km old

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