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So I pulled the vacuum line from the WUR and did some quick pulls and it seemed to help smooth out the top end performance, so gut instinct is telling me it's running a tad lean under load at the top end.
Definitely need to get the wideband O2 sensor installed and get fuel pressure tester on it to see what's going on.
Pulling the vac line off the WUR did introduce a vacuum leak and increased the idle to about 1,100 from 950, so for future testing I'll be sure to plug the vacuum port.
Can I get away with deleting that vacuum connection from the WUR, so long as when I test it the control and system pressures are OK and I can properly set an idle fuel mixture?
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