Mid eighties GM egr valve problem

Question

my mid eighties GM full size car with a 305 just started to have a problem...it runs fine at idle.....runs rough/sluggish at speed......when I take my foot off the gas there is a fast rattle in the engine.........and sometimes the engine likes to idle fast.....I replaced the catalytic converter last year ...........so now I am thinking of changing the egr valve....there is no service engine soon light on and this car is a mid eighties so no obd 2 system on this car......any other ideas? thanks

Answer 1

EGR valve got sooty,and rusty and dirty and then they dont work right. They either dont open or they get stuck open and cause the car to run lousey.

If the valve has been i the car since the 80's it is probably about time to either clean it or change it.

do you have  haynes or chilton manual for the car?? they explain alot.