Expert: Sean Halliday - 10/19/2006

Question
i have 93 prelude si 2.3 engine recently it has been idling so rough that it wants to jump into the traffic while at a stop. idling high low high low. replaced distributor,fuel filter, and idler sensor

Answer
Check all vacuum lines for leaks.You will need a vacuum tester and it could also be the intake manifold.The tester will give you more info.If your check engine light didnt come on then its possibly the vacuum system and also take a look at the EGR valve.Sometimes this happens when it is sticking,Is your fuel regulator ok?..You can check by removing the vacuum and looking for fuel leaking into the regulator.Its located on the fuel rail and looks like a small flying saucer.