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High NOX........ 200

Hello, this is a follow up of my question regarding high NOX last week.
My 88 240 failed the smog check here in CA. for high NOX.My car crawls to 20 MPH going uphill and overheats. I have replaced the CAT, set the timing, replaced the fuel pump. the in tank pump,duct taped the hose from the air filter(2 holes)to the throttle body, still the car lacks power and "pings" on acceleration. Can anyone please tell what I might have overlooked that caused the loss of power and high NOX. Thanks and god bless.






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