BOBCAT1

My 76 recently started idling rough. I have to keep my foot on the accelerator to keep it running. Any ideas? I tried to adjust the idle but could not increase it.

MrWhan

Bump after move to this section.

justanotherdoe

Could be lots of things, but here are the easiest to check:

Fire - check the condition of the spark plugs and plug wires. Unless all 8 cylinders are firing it will run rough.

Filters - check the fuel and air filters. If they have trapped a bunch of stuff flow is restricted and the engine can run rough.

A bit more difficult to check but not too bad:

Fuel - make sure you are getting plenty of gas to the engine. A dirty carb or fuel pump that isn't getting enough gas to the engine can cause it to run rough. A bad tank of gas can also cause a rough idle.

Compression - make sure you have good compression on all cylinders. Low compression can act like a bad plug or wire.

stock76

Check for a vacuum leak somewhere too. Maybe a hose has a crack in it or one popped off. Check all the vacuum lines including the one that runs down to the vacuum modulator on the transmission if your car is automatic.

Lon Wayne

I had a 350 in A del . truck I owned and once in a while it would spitter and sput on Idle I took the Jets out blew them out and down the raod Id go something Like suger in my tank and it would lidge up in the jets for some reason. Clean out the jets.

prostreeter

check cat. converter if so equipped