start problem (twice start)

I have a Luminar 90 and had a stall problem two month ago, and found useful information here. I finally cleaned AIC myself and put back again, the car runs good after that.

However, another small start problem come out. Recently, after one night sitting, the car won't start once. First the car turn over, then I turn the key back and start again, it will start and runs good. Every morning this happens. It must crank twice and then start. During the day and short time sitting, no problem on first start.

Another problem is engine oil leaking. It has already been two years. It had been checked and said main valve seal is leaking. I tried several Engine Oil Stop Leaking, still can not stop it. So just add oil over a while. I don't want spend ~300 $ to haul the engine up and fixed leaking because I am afraid more problem comes up.

The car is old, but still run strong. I hope I can still keep it if I can fix these small problems. Any information about start problem and suggestion for stopping leaking are welcomed.

Sounds to me like either

A) Possible pressure (vapor) lock in fuel tank from overnight sitting... open your gas cap the next time it sits overnight and see if there is alot of "air" noise. Then try to start after putting cap back on.

B) Fuel pump starting to go (can get it pressure checked at a garage of your choice)

C) Fuel filter is starting to block. When was the last time it was changed?

D) Injecters starting to fail and or dirty. Throw some good injector cleaner in and see what happens.

Right along the lines of what I was gonna say.

Stop leak additives wont stop a rear main seal from leaking. Only way to fix that is to replace it. It could also be the dristributor shaft O-ring. No the car doesnt have a distributor, I know, but its still got the bore in teh block where it was on the older engines. There is a plug there with the oil pump drive under it, the seal around that goes bad and leaks like a seive. Its right under the throttle body, about 2 inches in diameter, you can see it pretty easy but its a pain to get to.

Thanks a lot. I will try now.