I started the car one morning and it chugged then idled fine, when I took off it seemed as if it had 50% power. When kicked down the RPM's will jump then it will bog and decelerate. CEL has been on for 9 months, pulled the code P0421. I replaced the downflow o2 sensor and spark plugs which were caked with carbon. I've put 800 miles on since and no CEL's and the issue persists.
I pulled the upflow o2 sensor to relieve pressure in the case of a plugged cat but no luck. I pulled the fuel pump and the strainer was clean, I'm not sure that there is an actual fuel filter??? I have yet to test the fuel pressure. The car misfires a couple times over a 60 mile trip but no CEL. It has newer wires and intake tube. It also seems to have a deeper sound from the motor rather than the higher pitch whine it normally has. 247,000 miles. Any ideas?
I pulled the upflow o2 sensor to relieve pressure in the case of a plugged cat but no luck. I pulled the fuel pump and the strainer was clean, I'm not sure that there is an actual fuel filter??? I have yet to test the fuel pressure. The car misfires a couple times over a 60 mile trip but no CEL. It has newer wires and intake tube. It also seems to have a deeper sound from the motor rather than the higher pitch whine it normally has. 247,000 miles. Any ideas?
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