I checked my oil the other day and to my surprise a little white foam and a heavy gas smell were in the oil cap. What is this caused from i have searched and found one other thread with no response hopefully i get one . Also my car seems to have no pwer after 80-90 miles an hour. If i hold my foot on the gas pedal and hold boost at 5psi it will slowely drop to zero. Thought it might be a vaccum prob just double checking.

 

Try this link:https://www.rx7club.com/showthread.p...ighlight=white

Fuel dillution is a big issue in FD's. Some of the forum members change their oil every 1,000 miles. I change mine before every track event and at 1,500 miles otherwise.

Your other problem could be a lot of things. Vacuume lines are a good place to start.

 

I really think my car has some OMP problems....kind of academic since it blew up recently. But I NEVER saw any change on the dipstick, as opposed to when I had my FC I would see about a quart disappear between oil changes, every 2,000 to 3,000 miles or so.
I think I was getting a bit of fuel dilution, but didn't worry since I change oil in my FD about every 2K miles.