Too much timing???

dgibby said

I'll try a different light but I've been using it for 4 years. I've also had the same distributor for the same time and never had an issue, always had 20 built in and never it never fluctuated.

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Then you should probably look at the advance mechanism itself and make sure it isn't rusted or have other issues that cause it to move when warm.

I'll have to find my catalog and see exactly what advance mech is in the 37. If it's the typical one they are pretty much bullet proof.