Truck is very sluggish when going up hills. Seems okay on highway (no hills) though. Any suggestions or common problems with these?

Chances are your Caravan uses thin plastic vacuum tubes under the hood. When you go up a hill under power or engine brake going down a hill, the engine will rock back and forth in the engine bay. This will sometimes bend (close off) the plastic vacuum lines causing the vent settings to change (even though you did not touch the levers) Either avoid the conditions that cause the problem or just expect it when going fast up a steep hill and live with it... or... change the vacuum lines to the traditional stiff rubber line which should stop the kinking. Stiff rubber vacuum lines should solve the problem. Hope this answers your question.

Never heard of the converter being the issue. The system can be tested with the correct scanner, was that done. Do you have a loss of power of feels sluggish up hills or wnen accerating hard?

I would think that you need to replace the spark plug wires and the distributor cap and rotor here.

'm sorry but I believe you have this posted in the wrong product category? Please re-post the question in the proper category if this is the case, otherwise you have my apologies. This is the car and truck problem category

Does the trany fluid smell burnt? Might want to have the trany flushed - torque converter too - and replace the filter in the trans. FYI you may know this but it is not recomended that overdrive be enabled when pulling a trailer - especially a heavily loaded one. Does your town have lots of hills - this is an added stain on the trany.

Could be dozens of things. Sounds like a faulty spark plug / wire.

remove plugs and check for carbon tracing . if found plugs and wires will fix problem

first pull your dipstick for the oil look to see if its murky or milky looking or if the oil level is higher than it should be if you dont see any of this start the car and walk to the tailpipe look to see if you have white smoke coming from it if you see 1 or all of these things then you may have a bad headgasket. if you dont see any of these things you may want to have your radiator pressure tested it sounds as if you have a developing problem with the radiator or the head hope this helps.

I THINK THEY MAY HAVE DAMAGED THE PLUG WIRE BOOTS, TAKE A LOOK AT THEM AND SEE IF THE RUBBER BOOTS ARE TORN OR DAMAGED, CHEAP TUNE-UP SHOPS ARE FAMOUS FOR CAUSING THIS KIND OF DAMAGE, THERE IS A SPECIAL TOOL TO REMOVE THE WIRES WHICH GET STUCK TO THE PLUGS, MANY YOUNG KIDS DO THE WORK BUT DON'T EVEN KNOW THE TOOL EXISTS.

have fuel pressure checked if ok should be approx 60psi.if ok try disconnecting mass air flow sensor connector to see if problem is eliminated. this the computer in to a default mode.the sensor is a common problem.thanks from schleck