I have a 1989 chevy blazer with a 5.7 liter. I have changed temp sensor and throttle position sensor, but still have high idle. Wondering what else to check to remedy problem?

. Clean/replace Idle Air Control Valve/hoses, throttle plate, throttle body, and ports. Here's what the IACV looks like:

http://shop.advanceautoparts.com/Pro...pe=506&PTSet=A

This link may provide some guidance:

https://www.askmehelpdesk.com/cars-t...ml#post1054149

. Adjust throttle cable--this may be the heart of the problem. Likely, back off one nut and tighten the other.