I have a 99JGC. Lately I've noticed a severe loss in excelleration. In turns it sometimes acts as if the engine losses power completly for a few seconds before jerking back into acceleration. I have a brand new fual pump and filter. This thing with throtle position sensors is new to me. One other thing, I just noticed today that there seems to be a good bit of gummy oil buildup at the exhaust tip. Any help is greatly appreciated.