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Old 03-08-2008, 02:39 PM   #8
dougkmcse
Scooby Newbie
 
Member#: 85938
Join Date: Apr 2005
Chapter/Region: NESIC
Location: Bellingham Ma.
Vehicle:
2004 WRX
WRB

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I had this issue on an old car of mine. At a certain point the tach would jump around. It ended up being a bad control module. One way to check. Does it do it if you are at a stand still? If yes have someone rev the engine until it happens. Place your hand at the tail pipe and feel the exhaust. It should be a constant feel from the cylinders. If you have a miss you should be able to feel it. If you have any questions let me know.
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