The truck does start right up and idles good. When the truck is warmed up, you can shut it off and turn the key back on and hit the starter button and she fires up immediately. It will take off, but as soon as the truck is under a load (pulling itself), it begins to miss. I don't know if you would call it backfiring, but it does pop out the exhaust some on acceleration, not deceleration. I have not checked for vacuum. It could be bad points or condenser. How would I know without buying another set?
One other note...the spark plugs are sooty black, but are not wet. I also noticed that when I accelerate the truck in the shop, it blows an oily substance out of both exhaust. I have a place on the floor right below and behind each exhausts that looks like someone sprayed oil. Not thick, but enough to notice.
[quote=bartamos]You need to describe the trouble to us a little better if you can. Going down the road for a while then starts missing and some backfire is what I read.
I would suggest that timing does not run good then miss. A intermittent spark problem or a CARB problem OR BOTH are my thoughts. Can't tell which by the symptoms yet.
1. Does it start right up?
2. Does it take off and drive some?
3. Then it begins "missing" ?
4. When does it backfire? Acceleration or deceleration or ?
5. If you live anywhere near Jerry. Go there ASAP.
6. Any vacuum leaks?
7. Ignition switch OK, all ignition wires tight?
8. You don't have a compression problem. There are inaccuracies in that test if not done carefully and cylinders are within 10% of each other anyway.
9. LOTS OF BAD new points and condensers being sold. Try NAPA next time.
10. You "set the timing again". Please explain carefully to us how you are doing that. What is your total procedure?
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Last edited by Darrell Day; 11/05/2018 2:34 AM.
