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Check your wires at your fuel pump. Make sure the sender wire didn't pop loose.

One of many when you look around Another chopped topped XJ - NAXJA Forums -::- North American XJ Association

Check your exhaust hanger on the tail pipe. Under load the tail pipe could be hitting the shackle.

My first guess is the cps (crank position sensor). Here is a link that may help you out too.. http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm