i have a 96 2.4l and when i try to start it it runs really rought for about 30 seconds then just dies with a back fire. ive check the timing like five times and its always been right on. any one know what it could be?

It could be a nbr. of things. Here is my first guess: vacum hose from the MAP sensor disconnected or broken.

check the codes......if you can

Maybe the fuel pump. My friends mustang was doing the same thing turned out he needed a new sending unit in the fuel pump. When you turn the key to 'ON' can you hear the fuel pump start up?


(99 - Sunfire - Red - 2200)(95 - Cavalier z24 - Purple - 2.3 quad four)

if its starting for 30 second the pump would " appear" fine, but the oil pressure switch may not be keeping it running( so i doubt this is the issue because you stated it runs for 30seconds)...first thing that comes to mind would be maf froms the sound... but those dont have one..so check the map....the hose to it usualy cracks ( common problem), if that doesnt do it check your fuel pressure and volume(if pressure is good and volume is low, replace fuel filter). if still a no go find a scan tool and check if your getting a cam sync

well i think weve replaced almost every sensor on the thing but still nothing. and the fuel pump turns on but sometimes when you just turn the key to ON you can here it run but it wont shut off untill you turn the key OFF .and we got good pressure, maybe to much flow? the plugs keep getting flowed after it runs then dies