I've got a 1999 Explorer 400 4x4, it's got a 2-stroke engine and I can't get it running right for the life of me and deer season is coming up! Here's my problem: The engine feels like it has no power, in nuetral it will not rev up all the way, maybe only 1/2 - 2/3 of the way, when in drive it has no power past like 20mph, it just won't go, it sounds like it wants to go faster but the engine just won't let it rev up much at all, the throttle also sometimes feels non-responsive. Any ideas on what might be my problem would be greatly appreciated, thanks so much.