I have a very intermittent problem, that has only happened 3 times in the last few weeks. Ill be on the freeway doing about 80mph @ 3k rpm....then the car will bog like its hit a rev limiter , rpms will drop to like 1.5-2k for a sec then it will go right back to normal. The problem showed up before I had a new cap/rotor put on and has done it once since that....ngk plugs and wires are fairly recent. Car is an ex 2.3 manual...has v2,header,exhaust and has about 150k on it...use synthetic oil and 89 octane fuel....Car was been very reliable and started this after a recent 400 mile road trip.....My mechanic cant find anything wrong w the car and as the problem happens so infrequently its hard to guess at what it is. No cel or any other symptoms....Anyone else had a problem like this? Thanks