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Discussion Starter #1
My old 99 runs terrible only when it rains, but it runs great all the time?
Any suggestions? I would appreciate any help out there.Thanks
 

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Does it still run bad if it's raining but the windshield wipers are off? If it's just with the wipers on change the cps

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Might have a windshield leaking onto the GEM or PCM.
 

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...don't drive it in the rain? :hehe: just kidding.

You are gonna have a bad connection, cracked wire coating or something somewhere that is likely getting water in when it rains. Can you give some more detail? How does it run? Does it do it right from start up sitting in your driveway if it's raining or do you have to drive for a bit and get spray swirling around?

I agree that CPS/CPS wiring could be a likely culprit so I would put a new one in and inspect the wiring. After that, I would start your truck then use a garden hose to SLOWLY AND METHODICALLY pour water over your engine/wiring until the symptom starts, starting at your new CPS. Don't use a spray nozzle or something so the water blasts all over. Don't get excited and hurry. Soak a small portion then wait a minute cause it may take a bit for the water to penetrate. If nothing happens, move on to the next area and so on.
 

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Sorry, I should have said "if it's not the wiper motor issue then..." in my post.
 

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Discussion Starter #8
It starts stalling once I drive it down the road. It has died at a red light also. When it is dry without water it run great. I will try it without the wipers on next time it rains when I get going. Thanks guys I appreciate your time & help. Dave
 

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You can go try it with the wipers right now. If that's the issue water has zero to do with it and will act up.
 

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Discussion Starter #11
O.K. so today I drove first thing this morning about 40 MPH & cleaned my windshield for about 3 min. & it started acting up. I guess it is the windshield wiper motor. Thansk guys
 

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Weird, never heard that one.
 

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Me either! I love reading these forums...you learn so much. And besides...what else are you gonna do on the pot?

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Change the CPS and you should be good to go
 

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Discussion Starter #15
O.K. today it starts great, running down the road and the truck looses the accelerator pedal power. The truck just idles when you give it the pedal. It goes forward & reverse but only in iddle no rain either. I`m at my witts end with this 1999 model. Please help
 

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That sounds like TPS

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x2 throttle position sensor.

Relax brother don't panic! Electrical issues are frustrating and a PITA for sure but don't give up :)
 
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