On idle, my 88 chevy blazer TBI goes down to about 200rpms almost stalls and tries boosting back up to about 400rpms. I too apart the fuel meter cover to see if maybe the fuel pressure regulator was bad. It did not help. I tries cleaning all the fuel ports inside the tbi. The truck is electronically fuel injected. On idle, there is not a series of sprays of fuel from the fuel injectors. They both drip. Could this be a bad signal from the ECM? or Are these lazy fuel injectors?