Wankelteer

Took my car out today to run a few erands. I let her spool up a bit on merging and stop lights, the usual. She was running at temp, I went to a store, let the turbo cool a bit in the parking lot, turned her off, and went in the store. Came back and tried to start her. She turned over and would hit about 500 rpms but then die right away. I was pushing the throttle to let some air in but no luck. It took me about 5 tries untill I finally got her to start. This worries me. I am also experiencing idle problems, not all the time, but sometimes. Sometimes she will try to idle as low as 500rpms. Anywho, I'm thinking I should start saving my money now so I can get a rebuild for her, wanted to spend it on other mods, but o well. The car is an 87 TII with about 150K miles on her.