Hi hatazcat,
Thank you for the donation.
There are many possibilities for the symptoms described and they are:
1. Clogged catalytic converter or exhaust system. The exhaust gas is not going out fast enough at higher speeds and this would bog down the vehicle.
2. Clogged fuel delivery. Could be a clogged fuel filter resulting in insufficient fuel supply. Low speed does not have problem as the fuel is sufficient.
3. Throttle position or air flow sensor fault. This would normally trigger a code and the Check Engine Light should show.
Check those out and see if any faults are found.
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Sunday, May 24th, 2009 AT 2:55 AM