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Discussion Starter #1 (Edited)
Background: got a bank 1 lean and cylinder 1 misfire. replaced spark plug wires and plugs with ones from the stealership. codes went away for a few months, until recently.

Problem: Been getting a p1135 code recently, the truck has horrible gas mileage and no power going up the hill. The code seems to go away whens it cold outside and comes back when accelerated hard. Ive been reading on it and everyone seems to think its something different.

Any ideas on what it could be?
 

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Background: got a bank 1 lean and cylinder 1 misfire. replaced spark plug wires and plugs with ones from the stealership. codes went away for a few months, until recently.

Problem: Been getting a p1135 code recently, the truck has horrible gas mileage and no power going up the hill. The code seems to go away whens it cold outside and comes back when accelerated hard. Ive been reading on it and everyone seems to think its something different.

Any ideas on what it could be?
cylinder 1 misfire isn't good. the P1135 is usually related to bad front 02 sensor. but i'd check your compression and make sure everything is ok there.
 
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