Re: My engine sputters and jerks only when it is raining...
I'm not sure if you have solved your problem yet but, I had the same problem. I found out that each individual spark plug has it's own coil. There were hairline fractures in the coils allowing moisture in making the engine miss. I had changed all six and the problem stopped. They were about 50 bucks a piece but it solved my problem that sounds similar to yours.
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First the throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean. Engine running too cool means that either the thermostat is stuck open or the coolant temperature sensor is defective. Both should be replaced since they are in same area.
You have a bad coil on one of your cylinders, most likely one in the rear. If it is in the rear, have all three done as most of the cost is in the labor. I only had one done and a month later another one in the rear went.
I cant say I have ever even seen one of these, but lets start with this; Most vehicles can tolerate quite a lot of moisture (driving in heavy rain) but when it is 'flooded' with water, even garden hose pressure, that water is going to get into places it shouldn't. Your mechanic may may be going down the right path but try this first; remove spark plugs and replace if they have 50k or more miles or any are dark brown to black on the porcelain around center electrode. When you gain access to them and after turning them out about 1.5 turns, blow out water and/or dirt from around them with compressed air, this keeps it from entering plug hole. While you are using air, blow out spark plug wires/boots on both ends. As I first said, I am not familiar with this engine at all so I am not sure if you have a single coil or multiple coils. Blow out any water in any connections to these if possible. Replace boots/plug wires if they show any sign of arcing/excess wear (cracks,tears,brittle,torn) or more than 50k miles.When reassembling use a good quality dielectic silicone grease To help 'weatherproof' them.Make sure you did not damage or dislodge any other hoses/tubing/ect.. when cleaning.Hopethis helps! Please rate me. Thanks!