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Old 01-20-2007, 02:40 PM   #1
Scooby Newbie
Member#: 138288
Join Date: Jan 2007
Default 2000 2.5RS Fuel Control problem

I have a 2000 2.5RS which has been aftermarket upgraded with turbo/intercooler setup running at 5psi. After 60k miles of seemless operation (car at 100k miles), it's developed a problem of running extremely lean above 3,000 RPM. This problem occasionally disappears for a few moments, but otherwise is pretty consistent. Cleaned the injectors, replaced the fuel filter, checked for any ECU codes, and rebuilt the Vortec FMU, none of which has helped. Any thoughts on what could be causing this before I try replacing the fuel pump?
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