Similar to a question I've posted recently but have more data now.
'89 Toyota Cressida, 7MGE engine. On cold fire-up it starts great, will run great all day.
....except if I get it up to running temp then park for say 20 - 30 mins, enough time for a trip into Walmart, then come back out, it doesn't want to idle. If I get it in gear and get underway, it generally clears up. By the time I go a few blocks, get to a light, it's idling fine. Once it gets running right, it's strong. Accels hard and smooth, no noticeable issues that I can detect. I've noticed this pattern repeat itself multiple times now - it only recently started doing this.
Put in a new fuel pump but still exhibiting this behavior.
Any prime suspects come to mind?
Thanks.