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Q: misses when going uphill after hot on 2000 Dodge Dakota

run good when cold
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Load related issue - could be fuel pressure or bad cap/rotor/wires ...Mileage on engine? Maintenance? ALSO COOLANT TEMP SENSOR FOR PCM may be stuck cold ./not the sender for your guage/light
did check air filter have cod po455 i replace gas cap reset and came back on 10 days later. can that cod make it miss?
Is P0455 A code for purge solenoid? that could create an internal vacuum leak when activated usually after running for a few minutes.
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