Engine will start missing and backfire when just starting to open throttle.
Will idle and rev up fine once past first opening throttle.
Has new propane regulator, fuel filter, spark plugs , wires , rotor and distributor cap. Changed pvc and vacuum hoses.
Vacuum advance is holding vacuum.
Compression test and cylinder leakdown test good.
Cleaned throttle body.
Has original distributor with high hours run time, never been changed.
Anyone know what may be cause?
Could coil or distributor cause this?
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