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Cadillac Seville SLS Questions

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What is causing this. It has 61,000 miles and quite s down when it warms up
I was driving on the highway with the cruise set and it kicked out of cruise and my speedo was jumping around. I friend of mine said it is the speed sensor is he right?and where is this located at need help
My 4.9L northstar leaks oil bad. I tried looking for the leak but there is just oil everywhere. So I figured I would start with the more comon gaskets and work my way from there untill there all changed. I would like to pull the motor and rebuild it but I can't have it off the road for long.
When the gas gauge reaches a quarter of a tank, it travels in the opposite direction. What can the issue be?
I check the blower motor I cleaned out the vent with leaves under the hood the car is still blowing out cold air the

po171-po174-po300-po410-po741 & check engine light does not work.I bought another PCM.
Should I invest and get fixed or turn around and sell on craigslist for what I payed. I have heard oil leaks are such a common problem after I bought it, the car only had 89000 miles on it I thought it would be a good buy!
I replace both high speed relays, and it still kicks the code, amI missing something, can the wrong relay for low speed affect this at all?
everytime i pull the hose apart the coolant is coming out but when i starts it, it won't go through.
these are the two codes that came up on the ckeck engine ligh test
where is the transmission control module located at
Will this casue me to have a small oil leakage? I have a small oil leakage coming from somewhere?
where is the location of the starter
It runs great unless it has to sit and idle, then it skips but never stalls out.
3 LIGHTS:ABS/BRAKE/TRACTION CONTROL AND SERVICE STABILITY SYSTEM HAS COME ON 2 DIFFERENT TIMES, WHEN I START IT AGAIN LIGHT GOES OFF. THIS TIME IT IS STAYING ON. WHY AND WHAT DOES THIS MEAN?
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