I just purchased a 94 Accord EX automatic w/ 60k original miles. Car is in mint condition. It has two problems. When its in "D" and I come to a stop the idle stays steady at 500-600 rpm but the car shakes pretty bad. So I bought new plugs/ wires, cleaned out the TB and checked for vacuum leaks but it still has a rough idle. Could a dirty IACV or FITV be causing it to have a rough idle? I thought when those are dirty they cause a pulsating idle not a rough one. Could the MAP sensor cause it to idle rough? Also the car has a really stiff gas pedal? Is this normal? What could be causing it to be so stiff? Any advice would be helpful, thanks!

 

It could be the IACV or a dirty EGR port. Try cleaning the EGR port (DIY instruction in the Accord FAQ) See if that helps.

 

The EGR is not operational at idle RPM; try cleaning the throttle plate area with a toothbrush and Berrymans B-12, also remove the IACV and blast it out with the carb cleaner and compressed air