When this happens, does the check engine light come on? Also, when was the last tune up with a fuel filter? Does it seem to do this only under a load or can you be feathering the throttle lightly at that speed and it still happen? Finally, I would like you to check the fuel pump pressure. It is easy to do. Here is a how to video and directions. You will need a fuel pressure gauge. Most parts stores will lend or rent the gauge to you.
https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm
Let me know what you find and the answers to my questions.
Joe
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Monday, December 14th, 2009 AT 9:19 PM