I have a 1996 camry Le with 165K, last night the check engine light came on and the speedometer would flucuate all over. When driving at hwy speeds it will drop to o MPH and it feels like the transmission is slipping, also it kicks off the cruise control when this happens. I checked the tranny fluid and it seems fine, what could cause this? Almost forgot it is the 4 cyl engine 2200 series.