This is a 1995 Caravan, 4-cylinder 2.5 L.
I have spent the past several months doing work on this van, when I had time available. The reason for doing all of this work was because it had unknown maintenance history, and I was having an issue with very difficult starting after sitting several days, and sometimes while driving, the engine temperature would creep up close to the maximum--or even reach the maximum, but then go back down to the halfway point, also the heater would barely get warm.
The work done includes:
1. Replace all belts--water pump/alternator belt, power steering belt, A/C belt, timing belt.
2. Replace all hoses--radiator hoses, heater hoses, transmission cooler hoses.
3. Replace water pump.
4. Replace heater proportioning valve, flush heater core with garden hose.
5. Replace coolant temperature sensors (2 qty.).
6. Replace valve cover gasket.
7. Replace spark plugs (existing plugs looked fine, distributor cap, rotor, and wires looked to be recent so I didn't change them).
8. Install throttle body rebuild kit (gaskets, O-rings).
9. Replace throttle position sensor.
10. Replace fuel injector.
11. Replace inline fuel filter.
12. Replace brittle, damaged vacuum hoses, fittings.
13. Replace A/C gaskets, O-rings. (A/C wouldn't hold Freon for more than a day or two and I could see dye leaking out one of the gasketed connections.)
13. Change engine oil, filter.
14. Change transmission fluid, filter.
So the van sat from roughly Thanksgiving until now. It starts ok, but now seems to have a misfire, noticeable at idle, and seems to have poor performance/acceleration. Before I did anything to it, it ran fine. At least the engine temperature stays just under the halfway mark, and the heater works now.
Any ideas? Is this when I have to give up and pay a shop to look at it?