Running rought... ideas?

[tomford]

Hey guys, we have an 87 3/4 with a 350 and tbi i think. Lately its been running real rough at idle, and almost dieing. Best way to describe it is that it sounds like it has a cam in it thats really way too big.

Any ideas

Thanks
Tom

 

[NorCal_Chris]

vacuum leaks.

 

[Disciples Performance]

vac leak, timing, tune up possibly

 

[Recon!]

vacuum leaks.

yep

vac leak, timing, tune up possibly

yep again.

A few weeks ago my K5 was acting the same way. New vacuum lines/plugs/wires/cap/rotor/coil and everything runs fine and dandy. Did I need all that stuff? Probably not, but it didn't look very good and I had the money so I went for it.

 

[xCaliK5x]

I got a similar issue I'm dealing with, done vacuum leaks and tune up easy stuff. I clamp off the brake booster and the idle doesn't change, but if I unplug the ECT the idle goes up to normal and smooths out. I need to adjust the valves too....

 

[Ck1500]

i had a similar issue with my 87.. and come to find out the idle fuse was blown on the fuseblock.. i had some wiring issues that must of caused it from before.. but it was lopping like it had a huge cam... and i also noticed the EGR valve was 2 pieced.. still connected with shaft but the vacuum head was loose as a goose... replaced both...

and idles like a top

hope this helps