Rx-7$4$me

Well, I took off my manifold , polished it , removed my cruise control, and threw my car back together. It was fine in the beginning allthought he vacuum went down from 16-17 to 14-16. Started driving it around a little bit, and noticed that sometimes in first I would be giving it a certain amount of throttle and the car would buckle every so often at any given rpms below 3000. Now tonight, Its been running fine, no problems, and on the way home from my girls house my vacuum dropped to 12-13.

It still pulls just as hard, enough that I kept up with afew crotch rockets tonight.

The problem is, is if I give it some gas, or I have been driving and come to a stop and push the clutch in, the idle stumbles and drops to like 400-500 rpms and stays there till I give it some gas.

If im just sitting in place and I rev it, it revs up, then I hear this light clanking noise and it gets to like 4-500 rpms and almost dies.

IS my motor on its way out?
I do have almost 84 k on it.

I replaced my MAP sensor vacuum line just a min ago, fired her up again, and it idles with the driving lights on at about 700-750 rpms pulling 14 to 15 mercury in vacuum, but still has that weird stumbeling problem.

Whats going on???

Steve.

Mods below

Rx-7$4$me

It starts really well, and has no problem starting when its hot either... whats going on?

kyle@insight

Kinda sounds like a vacuum leak. You sure you got everything back together right? When you took your manifold off I assume you meant the intake manifold? Are you sure you've got everything sealed off right? Sure nothing accidentally came undone? Search around in there a little bit and see what you find.

Rx-7$4$me

Thats what I thought too... I did brake one of the studs holding on the intercooler elbow, think its causing any problems? But then I Thought a LEAK would cause a higher idle, and I would loose boost too.

And I just went outside took it for a spin again, and its running perfect again -15 to -16 at 8-850 rpms

kyle@insight

I think one of the studs could definatly cause it to not seat properly, thus causing a vacuum leak. In my experience a vacuum leak has caused the idle to fluctuate and typically idle lower.