Re: Erratic problem
Intermittent problems are usually related to intermittent discrepancies. Crap rolling around in the fuel tank or water for that matter will either occasionally block the fuel pick up tube in the tank or it will suck up a slug of dirty water. The sticky valve discrepancy is real. They will work fine for a while then start sticking just enough to slow the valve opening & closing which plays hell with the valve timing and can give you intermittent missing or after fire in the exhaust. Ignition intermittent problems can be due to leaky condensers or worn out spark plugs. An old worn distributor shaft can give intermittent problems with the rotor contact and breaker dwell. Carburetors and fuel pumps rarely have intermittent problems. Internal blockage, leakage, or bad accelerator pumps generally give trouble all the time.
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