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2002 X-Type: automatic transmission..drove..jerk..acceleration…

I just purchased a 2002...
I just purchased a 2002 X-Type 2.5 (automatic transmission) and drove it 200 miles over the weekend. Then, last night my wife noticed a jerk or shimmy a few times on acceleration while driving to the local grocery store. Any ideas?
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Answered in 23 minutes by:
11/21/2011
Jaguar Mechanic: Richard, Jaguar Technician replied 11 years ago
Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 16,763
Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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Did it feel like an engine missfire? Did any warning lights or messages come on?
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Customer reply replied 11 years ago
No warning lights or anything of that nature. It somewhat feels like a misfire but more like sluggishness (like it takes a split second for the fuel injector to deliver). My wife says she notices it when the car is moving from 2nd to 3rd gear.
Jaguar Mechanic: Richard, Jaguar Technician replied 11 years ago
We may have a failing ignition coil(s) causing this. We should make sure you do not have a vacuum leak. Start the engine and listen for a hissing noise while idling when the engine is cold. The PCV hose sometimes will split and the IMT valves sometimes leak. This will cause vacuum leaks. The PCV hose goes from the valve to the intake and the IMT valves are the electronic valves located on the right hand side of the intake manifold. I also see issues with the booster hose from the brake booster to the intake.
Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 16,763
Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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Richard, Jaguar Technician
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