throttle body or idle air control value
The power brake vacuum booster is probably failing.
Bucks- lack of power- rough idle
If this happened all at once, check the vacuum lines. A cracked or broken line will cause high or rough idle.
YES it does. It should be close to intake.
Check the motor mounts.
The 1998 Blazer could have several problems causing rough idle. Check the air filter, fuel pressure, and EGR valve for a clog to look for the problem.
Could be in need of a tune up Could have a vacuum leak
You could have the firing order messed up.
sounds like a vacuum leak
check the function of the IAC solenoid and the ECT senser
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rough idle smell gas
When the idle goes rough, you must idle the plugs. Else the car plugs roughly.
With mine, the rough idle was fixed by changing the spark plug wires.