My A4 was running fine, then began showing brief dips (a fews seconds) in rpm almost to stalling, but never did really stall, at random intervals around 10-30 secs. Knew we had a slight leak from the fuel pump so replaced that with a Moyer rebuild. Ran OK for ~ 30 minutes after that then started showing the symptom again. Yard then checked the filters for signs of contaminated gas (negative), replaced the coil, re-checked the fuel pump installation, checked distributor and points: no change. Recently ran as long as 3-4 minutes at speed one time with no dip, now dips quite often and now stalls on about one half of these. Always starts quickly and easily immediately after stalling.
No difference if under load or idling, and does not seem to be affected by advancing the throttle or more choke, although these latter two are a little harder to be certain about since the dips are so brief.
Does not sound to me at-all like a mis-firing nor lean mixture problem--just not enough fuel, as though the throttle were pulled back momentarily. Hmm, maybe I need to check the throttle cable and linkage? Fuel vent is another possible culprit I can identify from similar threads here that we may not have checked yet, but any other advice would be most welcome.
I'm wondering if the alcohol/water separation problem at the bottom of the tank might be difficult to recognize as contamination at the fuel filters, and that's what I really have?
No difference if under load or idling, and does not seem to be affected by advancing the throttle or more choke, although these latter two are a little harder to be certain about since the dips are so brief.
Does not sound to me at-all like a mis-firing nor lean mixture problem--just not enough fuel, as though the throttle were pulled back momentarily. Hmm, maybe I need to check the throttle cable and linkage? Fuel vent is another possible culprit I can identify from similar threads here that we may not have checked yet, but any other advice would be most welcome.
I'm wondering if the alcohol/water separation problem at the bottom of the tank might be difficult to recognize as contamination at the fuel filters, and that's what I really have?
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