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This is exactly the problem I am having. Mine has 180K miles and had a full tune up 30K miles ago. Last night I installed a fuel filter...it did not help. This weekend I am going to install a new CPI injector/regulator unit. The only other possibility I can think of is the fuel pump.
One question I have for the experienced folks: Once I remove the plenum, if I don't see any washing from leaking gas, can I assume the CPI unit is good and not change it out? In other words, does the CPI have to be leaking to be defective/ worn out?
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