thank you everyone for the input. I don't believe it's my imagination. I
drive it everyday, I know in dry day, it gets more power.

Mike, I bought the plugs, cap, roter, and wires from the dealership. the air
filter was changed 10,000km before.

Is it possible the wires cracked(which I did not check) not insulated, or
the end of the wires not fully pushed into the plugs.

"Mike Romain" > wrote in message
...
> How is the air filter? When they get older humidity can affect the air
> flow through the dust.
>
> I don't know what plugs you used, but I have seen a pile of those
> expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
> engines. They last for 6 month or a year, then the engine power up and
> dies. The best is a Champion in my opinion.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
>>
>> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
>> power
>> in sunny days. In wet days it's lack of power.
>> I changed plugs, ignitions wires, cap and roters 30,000km before.
>> Anything I need to look into?
>>
>> thank you in advance.
>>
>> Herb