Driving along 40 mph sudden shut down.
Sounds more like you have a bad alternator that is unable to keep the battery charged. Once the battery dies while driving, the spark plugs will no longer be able to ignite and the fuel won't burn, causing your engine to shut off. Some cars have a fuseable link between the battery and alternator that will burn out, or partially burn out causing the same symptoms and is a lot cheaper to replace. Check that first.
SOURCE: while driving im not able to go over 30 to 40 mph then it slows
The things you may want to look at first is the fuel filter (if it wasnt replaced), the CAT (if it has over 100k miles or has been burinng oil), a cylinder compression test and check the timing. Does the truck idle smooth?Did the truck get a COMPLETE tune-up? And are the symptoms constant?
SOURCE: 2004 chevy malibu 2.2 driving 60 mph shut down
either you have a fuel pump that went out, or your fuel pump relay went. These fuel pumps last around 100,000 miles, so if you're way under that, it's more than likely the relay, if you're close to that, it could be either.
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