So definitely didn't post "tomorrow" but wanted to follow up my last post. I got a reman distributor installed the day after the last post and the problem got worse...it was starting up better but was stalling all the time and then after a stall i had to wait 45 minutes or so. Brought the van back to the mechanic the next day and he put the old distributor back in. The frequent stalling went away and i was back to my familiar intermittent crank no start at operating temperature (with occasional stalling after heavy use). I ordered a used factory distributor from a junkyard and when my mechanic put it on the problem was solved BINGO BONGO. I spoke with the fellow who sold me the car and he said he had the original distributor replaced because his mechanics damaged it while changing the cap and rotor in 2011. So the lesson here is reman distributors are roflroflroflrofl for Previas. Now that my Golden Egg is running smooth I bought a 1993 Geo Metro Convertible LSi.
I'm having the head rebuilt as we speak...