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4G63 won't rev past 4k

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bo0st

10+ Year Contributor
835
24
Jan 26, 2010
Phoenix, Arizona
My GST won't rev past 4k all of a sudden no changes mods are just 190 walbro and ECMLink Full with a greedy BOV + K&N air intake filter

All of a sudden it won't go over 4k, it just hits 4k and makes that cool turbo noise but won't go over
 
Is it doing this?
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If so it's your spark plugs but your spark plug wires would also be causing your plugs to fail to stay lit. If your spark plug wires are old replace them with NGK's and put some fresh spark plugs in there. That should fix your problem.
 
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