Starts and idles fine but when i try to drive it stalls and sometimes dies changed fuel pump and filter but did not help

Had a 89 cavalier did that start then die it map sensor. Also check ground wires if the become too corroded they won't start sometimes just run weird

This I think would be either of two things, it could be your fuel filter or your fuel pump, hope this helps

you don't say if its petrol or diesel you could try changing fuel filters d ifficult siarting and running problems are usually fuel or electrical but try filters first

Check the idle fuel pressure. Load the electrical with headlights and heater defrost etc and see if problem gets worse. Attempt again with all accessories off. Could be fuel pump is getting low voltage at idle or fuel pump is failing. Bad fuel pump would definitely be a problem high fuel demand. Check vacuum line between pressure regulator to intake manifold.

Check for a air leak in the intake manifold. Gasket/hose etc. The P0171/P0174 is an indication that not enough fuel or tow much air. You can sometimes hear the air leak during idle.


Best solution is to use a graphic capable scan tool and watch the fueling trim/idle.

its could be the fuel pump, if its going bad then it could be causing stall and a gas hose could be bad to and is only allowing a little gas to motor causing it to stall also

TRY CHANGING FUEL FILTER,COULD BE CLOGGED FUEL FILTER,FUEL PUMP FAILING,FUEL COULD BE CONTAMINATED WITH WATER.IF FUEL SYSTEM OKAY,CHECK FOR SPARK AT SPARK PLUGS,COULD BE FAULTY IGNITION MODULE OR FAULTY IDLE AIR CONTROL VALVE I WOULD HAVE VECHICLE CODE SCAN FIRST BEFORE SPENDING MONEY.

have you changed the fuel filter

check for vacuum leaks at throttle body gasket. pvc valve stuck open.if all is good .change fuel filter .if still stall out check fuel pump pressure.if all is good .replace plugs and wires if they have not been changed.

the problem sounds like it is not getting enough of fuel. check or replace fuel filter to see if this helps, also make sure fuel pump is pumping the fuel at the right pressure. have pressure checked if need be. if not enough fuel a vehicle will run at idle, but stall under pressure.

you might want to chk. the crank sensor and or cam sensor. sounds more to me that it could be fuel problem. chk. fuel pressure. pump could be on its way out. don't be fooled by hearing the pump running as they sound like they are pumping but there not, at least not enought pressure to keep it running. pressure should be around 50 p.s.i.