Runs rough on acceleration

Charlie · Apr 3, 2021

Engine started running rough this last week on accelerating. Runs normal in Park or Neutral while revving. Runs rough in gear sitting still also. Replaced plugs and the in-carb fuel filter today and no difference. Truck died on the street last weekend and I found a vaccuum hose had split on the end and fell off. Trying to restart I flooded carb and could not start for a while. This flooding may have caused an issue in the carb. The last rebuild was July 2017. Thinking I may need to rebuild again, not sure.

Any help is appreciated.

crpntr78 · Apr 3, 2021

Might look at the vacuum advance weights in the distributor. Mine were rusty and stuck so my truck didn't run very well upon acceleration.

Charlie · Apr 3, 2021

crpntr78 said:
Might look at the vacuum advance weights in the distributor. Mine were rusty and stuck so my truck didn't run very well upon acceleration.

I have an HEI distributor. Would the weights issue be the same as the points distributor?

Craig 85 · Apr 4, 2021

Charlie said:
I have an HEI distributor. Would the weights issue be the same as the points distributor?

Yes, see photo without rotor on. I would check all you vacuum lines. If one split, the other are probably not far behind.

You must be registered for see images attach

Charlie · Apr 4, 2021

I have rechecked all vacuum lines, plug wires and all are good. Pulled dist cap and nothing bad found. Checked fuel lines and cannot find anything I can tell that is causing this. Would a bad ignition module cause this or possibly coil? I have had a no start due to the module before.

Charlie · Apr 10, 2021

UPDATE

I performed all the troubleshooting I could do with only having a carport and limited tools. Finally decided to take it to my tech and said my cam had finally worn down that is causing the rough running. He had discovered the #8 cam lobe was worn a few years ago when replacing the valve stem seals. It was worn and only raising rocker arm a little. He is in the process replacing cam. He is going to put in an Edelbrock Performer cam. He said it is the beefiest he could install without any other upgrades which is more than the stock one. Should be finished by next Friday.

Runs rough on acceleration

Charlie

Mopar by Birth. Chevy by Choice.

crpntr78

Full Access Member

Charlie

Mopar by Birth. Chevy by Choice.

Craig 85

Full Access Member

Charlie

Mopar by Birth. Chevy by Choice.

Charlie

Mopar by Birth. Chevy by Choice.

Similar threads

Latest posts

Forum statistics