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2002 pontiac montana. the engine will stall out on me completely while driving down the road. the tach falls to zero then starts jumping back n forth while my foot is on the gas. at times if i let off it will smooth out. it dies and is hard to start at times. and other times runs like a top. i tried unplugging egr valve and it ran ok for 1 day then back to its old tricks. im completely lost. while acting up it has a rough idle. but like i said other times runs great. it has 170,000 mile

Posted / edited by AnonymousUser on : 12-11-2018

Answers :

Fuel filter was change,spark plugs,THis is fanny engine cause a lot of problems,I have one,so far I control it.
Is the check engine light on ?
If one of the sensors fails, the light should come on and set a code in the computer.
If not, it could be a problem with the fuel system, such as low fuel pressure.
You could be loosing power to the fuel pump relay or the coil pack.
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