I have a 2001 chevy venture and I never had any probs. Only thing is the electrical goes out about 180,000 miles
On my Chevy truck it idles high when its low on antifreeze but if its not that more than likely its usually a vacuum line loose or cracked. good luck.
depending on the year some impalas have 6 inch glasspacks
My 97 Venture has two but I believe both are low.
it could be the idle speed sensor located on throttle body however i replaced mine and it still idles high. The code indicates lean air/gas mixture so i am still looking for small vacumm leak
YOU WILL DIE! have you check your IAC ??
raise the front up high and drop the engine and trans together out the bottom
There's a detent cable from the trans to the intake, check it out.
I have 91 chevy k1500, It does this, Sometimes it will idle a few minutes, then jump to high idle and check engine light comes on, And sometimes its as soon as i start the engine... I was told it was a vacum leak, But im no mechanic
Check for a vacuum leak or sticking butterfly valve at the throttle body, or possibly a sticking throttle linkage or throttle cable.
vacuum leak
It is built into the multifunction switch which controls your signals,high beams,cruise,etc...have to replace entire unit.
1995 blazer350 v-8 wont start unless i use starting fluid,once on it idles high