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Engine 258 Tuning troubles

Engine 258 Tuning troubles

HappyJohnny

Jeeper
Posts
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Location
cleveland
Vehicle(s)
78 cj5
43 gpw
19 JL
Started up my rebuilt AMC 258 i6 / 4.2l (1978 CJ5 ) and can't get it below 1500 rpm @3 deg timing. Idle stop screw is all the way out, vacuum disconnected.

If I set the rpm to 850, the timing is 10+ deg, and I can't give it any gas without stalling. At that idle, it also continues to run for a bit after turning off the key! Idle mix is 1.5 turns out.
 

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