My98MGTransAm

I have a 1998 Trans Am LS1. As soon as you start the car it idles at 1500 rpm the goes up to 3000 rpm and stays there I don't know whats wrong. Please help.

bene

iTrader: (16)

Vaccum leak. Check all the rubber lines, front to back.

My98MGTransAm

I actually did that, had 1 big vaccum leak but repaired that.

Z28_LT1

iTrader: (2)

is there still a problem?

bene

iTrader: (16)

You must've missed one still. It doesn't hurt to check it again for small holes and disconnected lines.

Reason why I'm saying this because when I did my LS6 intake swap, we left a line open and it did EXACTLY the same as you stated at the first post. It idled 1500 then it shoot up to 3K rpms. We couldn't figure out where was the leak until we look down at the throttle body, one of the line wasn't connected.

My98MGTransAm

At first it idled right at 3000 rpm, when I fixed the vaccum leak then it idled at 1500 rpm and then goes straight up to 3000 rpm.

My98MGTransAm

can try and check again there was 4 of us searching all over the damn thing!! thanks for you help.

elias_799

iTrader: (8)

did this just happen randomly or after you where working on your car ?