hey i have an 88 prelude 2.0si fuel injected with dohc. when my car warms up, it revs up and down uncontrollably! no vacuum leaks, good alternator, and just bought idle air control valve thinkin that was it, nope. also checked tps sensor and seems to be fine too. any other suggestions?????

 

check your egr for proper operation and cleaness

 

just put a brand new egr on! any other suggestions???

 

if your tps sensor is good, it may be the map sensor

 

any ideas how to test a map sensor? my book says nothing about it, and the cheapest i can find it is for $175 so I'd rather know first.

 

go to google, type in map sensor testing, on the first page, autozone.com comes up with good testing of map sensor.