Thanks guys, Paul
1990 chev 1/2 350 tbi. Getting code 24, 32, and 43. Sometimes my speedo sticks and a bang on the dash and the thing pops back up. Just done the egr ports and the knocking is gone but still sets a 32 code. Does the egr only open and shut when the vehicle is in motion??, hence the possibility the speed sensor is shot? . How would I check the knock sensor re code 43, I have a multimeter.Is there a way to check the speed sensor, does it run the speedo?. Can I put it on stands and run the vehicle while looking for a voltage at the vss with the wires off???Don't mean to be a pain in the butt, I like doing the work myself!!