97' sunfire engine misfire

08-14-2006, 09:51 PM
It's a 97' sunfire 4 cyl that at idle almost jumps from the engine bay with the shaking/misfire.. When we apply the trottle it studders then races sometimes smooth and sometimes rough until at about 1/2 trottle and then it seems to starve of fuel or justs bogs out.. This sarted with a little miss and now it will hardly stay running.. We've changed the plugs,wires,two coils,tried 3 modules,and a fuel filter with no change in the problem.. The engine light is not coming on and we can't seem to find a vacuum leak.. Anyone seen this before?

08-16-2006, 02:56 PM
This must be a new problem......

08-22-2006, 01:23 PM
Still working on it.. Still broke down...We've now changed the fuel pump in the tank, egr valve, injector wiring harness, and the ecm..

09-01-2006, 10:20 AM
Timing chain issue...

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