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Gas mileage has gone from 25 to 10 mpg.

Car: Isuzu, Rodeo, 1997, 6 cylinder     -    Back to Fix-It    -    Isuzu Repair Manuals

Q.1997 Izuzu Rodeo- Gas mileage has gone from 25 to 10 mpg. Two codes have come up:
P0401-Exhaust Gas Recirculation Flow Insufficient Detected Intake Manifold pressure -4.4psi --coolant@161f--calculated load value 1.6%--rpm 1095--Fuel trim status short term-4.69%(bank 1) 2.34%(bank 2) long term-3.13(bank1) -.78% (bank2)
P0301-Cylinder 1 Misfire detected -This just started. We changed plugs last week -the old plugs looked pretty good -the gap was about .046-.048" (new set at .044")and looked clean.

I already checked/done: Changed plugs

More Info required Did you replace the egr valve and clean the ports?

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