1994 Plymouth Voyager stalling when at running temperature

I just bought a 1994 Voyager. It idled like a charm. When the wife drove it home, she complained of a howling from the winter tires. No Problems. But now. As soon as it hits running temperature, and is put into drive. Stall city. It starts again, but will not run without some coaxing with the throttle. My manual states int he trouble shooting section that it could be either the gas delivery, or electrical. So. Have you heard of anything like this before, and if so. How could it be cured. I thought I would ask someone who knows these motors before I start exploring, and save the van and me some bad times:)