96 Tahoe SEsoon Light and rough idle.

I get a code of ECV.
At idle and all ranges of operation engine runs rough. More noticable at idle. vehicle actually may stall at times at idle. Acts as if a Plug wire is grounding.
Very itermittent. I will go weeks without incident. Then all of a sudden here it is!
Any ideas?

Kind of sounds like a plug wire arcing or grounding like you mentioned.

could also be the camshaft position sensor which would indicate a bad sensor or the distributor is not properly installed. have u tried cleaning the contacts under your distributor cap? they have a tendency to corrode

of course check your plugs for carbon deposits and plug wires for visible damage. if u have over 100,000 miles replace your plug wires! it is worth the $80 bucks after 2 weeks with better gas mileadge.

Also,
when I get the light and rough idle , the gas pedal is hard to depress. It feels as if its being held. When you apply enough force it will kinda pop then you can accelerate. Almost like the vaccum in the throttle body is so great that its holding the butterfly valve closed. :confused2:

I am definitely gonna do the wires and look at the cap.

wd40 should fix the gas pedal. unless the linkage is binding

Try running Sea Foam through your main vacuum intake line. Use as noted on the can. Then purchase Sea Foam Deep Creep spray, and spray that in and around your throttle body on the top of the engine. Open the throttle body/air intake valve manually and use a toothbrush to clean off the carbon around the edges of the throttle valve. Make sure the engine is warm when you clean the throttle body. And engine is running while pouring Sea Foam into the vacuum line. Note: pour Sea Foam slowly into the vacuum line. Make take a few times doing, but I guarntee this will fix your problem.

yea if sea foam doesn't work it should b the distributor alignment