1987 Jaguar XJ12 idle

1987 JAGUAR XJ12
99,262 MILES • V12 • 2WD • AUTOMATIC
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DPONGTORN
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the car starts and idles at 1000rpm when its cold. Then it increases to 1500 rpm when it warms up. when it warms up the idle goes up and down up and down up and down until you put it in gear then it drops down to 1000rpm again. whats wrong what do i need to do.
Oct 5, 2010 at 12:11 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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