I just put a new battery and alternator on, cars been sitting for a while, starts up fine. Idles good, when I give it gas it sputters, have to kind of pump the gas to get it going, is it a carburetor adjustment, fuel pump or filter? Has new spark plugs and wires and cap.
85 Monte Carlo 305 4 bbl
- Thread starter Ace85
- Start date
If an engine idles fine but stalls when accelerated or under load indicates a fuel supply issue. Using an analog dwell meter or a OBD1 scanner will help indicate such issues. Could be as simple as a clogged fuel filter. Very likely its a sticking float needle valve, especially if its a low quality needle.
Another possibility is a bad acceleration pump, cheap cup seals can swell when exposed to ethanol gas. Quick test is to manually push the acceleration pump plunger down and release. It should spring back up smoothly and quickly. It if sticks at any point its bad.
