Maurice,while this may not be as likely it is something that I have
experienced several times so if fuel flow etc doesn't help you might check
this especially if you have recently made any change to the ignition system
such as install a higher output coil, installed new spark plug leads,
installed new points, gapped the plugs to the high side of the gap tolerance
or installed a electronic ignition such as pertronics.
Any of these changes can result in cross fire ie. spark jumping to adjacent
plugs within the distributor cap, jumping from the coil output to adjacent
plug leads etc. This will show up as stumbling engine performance (not
usually backfiring) generally when you reach 2500-3000 rpm on acceleration.
You can check this by carrying a can of WD-40 with you when you go driving and
when the problem occurs just stop and spray the inside of the distributor cap
and wiring with the WD-40. Let the excess drain out...reinstall the cap and
drive away. If this clears up the problem you probably need a new
distributor cap, rotor or new plug leads.
Galr Hess
BJ8 35887
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