How do you know when to replace them? I have a 98 with 118k. It seems to run fine but doesn't go up hills on the highway very well. It accelerates good on the level but the grades it just bogs down and has a hard time going over 55 or 60. Like I said, it will speed away from a stop light with plenty of power... drives up to 75 or more on the level. Those hills kill it. With the specs on the V8, shouldn't be.
I wonder if it's O2 sensors, clogged cats, worn cam, MAF... looking for clues. Thanks
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