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2005 CTS-V, 1994 Infiniti Q45
7,657 Posts
Most independant shops that are AC/delco certified should be able to work on the cars......... and have the diagnostic tools also.....

200k on a 96sts??? That has to be a record...... 28k/yr!!

Plugs should last the life of the car... They only need to be replaced if they start acting up.....

Basically, replace all the fluids..... Oil, tranny FLUSH (and replace the filter if their is one, im not sure), brake fluid, etc..... Flush the radiator and change the TSTAT...... Along with filters (oil, air, fuel)...... You can also run some GM TOP ENGINE CLEANER through the engine, and it should make it run better.... For this you should run 1 can through the brake booster line (follow the instructions), and then I would take off the TB and clean out the inside area there with a rag and some cheapo TB cleaner ( i use valvoline synpower, $2 for a can), replace the TB, and run another can through the line......

Powertrain related, that should be about it......
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