weird idle???
 

i got a 92 cevy 1500 with a 350 mostly stock but my problem is when ive been drivin for a while and come to a red light my truck acts real weird it makes almost a grinding noise and feels like its idling too high but when a put it in park or nutral it stops any ideas on whats wrong

tune-up lately?

also check the hose that goes to you pcv, sometimes gets clogged at the throttle body. pull the t/b and make sure that it is clean also.

ya its had a recent tune up and the egr is blocked off and i pulled the throttle body last week and its good

idle
 

fc and check for tracking marks in dist. cap. notorious for it.