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Sounds like you have a leak in your fuel system, perhaps in a fuel line. This would be giving you the gas fumes as well as allowing the system to suck air which will cause your engine to run erratic. http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagInfo&Parameters=info ==NEW ANSWER== This is actually a common problem on GM vehicles, especially the blazers and S10s. The problem is most likely the EGR valve sticking open due to age/wear, carbon buildup or a piece of trash wedged in the valve. The EGR valve recirculates exaust gasses back into the intake manifold to help lower head temperatures. It should only open when the engine vaccuum is sufficient enough to engage the diaphram. The next time it is doing this, get out and tap on the EGR valve with the handle of a screwdriver or other solid tool. If it stops, change the valve.

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Q: Why would your 92' Blazer shake while at idle and smell like gas?
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