I have a 2000 Integra LS automatic with 110,000 miles on it. Recently I noticed when driving that when I was stopped at a red light it began to surge and idle a little low. After more driving it began to misfire pretty badly, but worse at idle. At times it seems as though it clears up and runs good but then will miss then miss worse all within the span of a few minutes. I have been reading up on google and found a few possibilities that I am checking as we speak but I wanted to do a post to try to get all the help I can.

So far,

1. fuses good
2. plugs good
3. wires good
4. fuel filter good
5. distributor and components good

My suspicion was that it is either 1 a vacuum leak or a leaky spark plug o-ring.

How would you go about checking this? If it were mechanical it would have to be consistent so it isnt a timing issue or any of those things.

Any ideas? What is the best way to check vacuum and related sensors?

 

Just had the same problem with a 98 Ls with 155k . So I bought new plugs,wires,cap,rotor when I got the car then was immediately hit with code 74 (cylinder 4) ..so I figured the distributor was crapping out so I picked up a new one from oreillys and timed it properly ...couple of days later code came back..by this time I was lost...went and used warranty on wires reset ecu...wasnt the problem..turns out I either got a faulty cap or rotor from auto parts store ( warrantied both out at same time) ..I should've bought oem in beginning but these were in stock