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My ‘98 12 valve seems to lack power at 2000 rpm and up.I haven’t checked my fuel pressures yet but I did pull the OFV and checked the spring. It was still intact and measured exactly 0.50” in length. Could it still be a bad OFV or did that rule it out?

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I don’t know the answer for sure but did add the pen-spring-trick to mine recently and performance improved everywhere. I put the spring in and cut it the same length as the stock spring’s length.
 
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