So I'm about to purchase this *cheap* 89 NA a state and a half away but I'm a little leery. I've been asking the guy some questions about the car, and he's been able to answer them pretty accurately, and I'm a naturally trusting guy so I think I'll go for this. The thing is, I had him run it for 15 minutes and shut it off and let it sit for 15, then start it up again, and he says it sputters for like 6 seconds then does the accellerated warmup, 3k for a little bit then 1500 then down to it's 900rpm idle. (I know, it's a little high but not enough to warrant a lot of concern)

I plan on rebuilding it but what could cause a 13B to run through that sequence when its already warm?

 

I think that's perfectly normal. Every time I crank mine up, hot or cold, it revs up to 3K and then back down to normal. If it's warm then it goes back to normal idle immediately.

 

Oh, thanks mate!