First thing I would do is remove and clean the main engine cable. You should find it on the left side of the motor. It's a large cable that has a rubber boot on it and a hose clamp. Loosen the hose clamp, pull the connector, clean well. Plug in firmly and tighten the hose clamp You might want to coat it with a touch of dilectric grease to keep away moisture and corrosion.
The engine can be "funny" if the connection is not good.
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Jvalich
http://www.badcock.com'04 FW 288 Vista "Mental Floss"