Transporter99

Alright, I thought I had this problem licked in April when I had my 18 year old distributor replaced. Until today. This is the 4th incident since April '10 where I can drive, and out of the clear blue the engine bogs until it comes to a complete stop. I can turn the car off for a few minutes and start it up, and it runs fine; until the car is in motion longer than 2-3 minutes. There have been few variables, but the constants remain unseasonably hot weather in each occurrence (low 90's/ high 80's each time). Below is a brief timeline/remedy of the issues:

First incident/ April '10: Car jerked & bogged down going 65mph on the expressway. Press the accelerator, and the revs drop. Main relay replaced the next morning. Issue appeared to be solved, and proceeded to drive 12K miles.

Second incident/ March 18, 2011: The car randomly bogged down in similar fashion to the previous year. Left the car with the Honda dealership for 3 days of testing & driving. No issue found or fault codes/ no remedy.

Third incident/ April 11, 2011: Driving home from NC, and (get ready for the surprise) the car bogs down again. Identical symptoms to the previous 2 situations. Car was towed and arrived at 3:30pm. Issue didn't replicate until 7:15pm, and thankfully while a Honda tech was driving! Again no fault codes, but they isolated the issue to the distributor. 9:40pm, I was on the road home with a re-manufactured dizzy. FINALLY...

4th incident/ Today: Came to a stop at an intersection, and the revs suddenly dropped to 250 rpm. I blipped the accelerator, and (drum-roll) the engine bogged, stuttered until shut off. 2 screaming calves and hamstrings later from pushing the car up a slight grade to safety, I called a tow to the dealership.

Again, this is a completely stock 93 Civic Si (K&N drop-in filter). No fault codes, random CEL light (doesn't come on always). I need ideas, guys. I did some searching and saw issues from thermostat + cooling, to ICM replacement, debris in the intake (none found), alternator, ECU issues or water pump & belt issues (Don't understand that one, but mine are 1.5 years old). NEED HELP!

Transporter99

any ideas?

AmorshC

Pcv valve. Cleaned the throttle iacv and fitv?