I've owned my 1997 LS since new( 130,000 miles). The gas milage has dropped off somewhat and she don't gain speed as quick as she used to (Passing). She don't smoke and always runs at 190 degress. My son installed a K/N filter outside the factory box filter for me, and all it seemed to do was make my acceleration louder. Any chips i might install that have really worked for others without going broke? Regards...........Tom H

 

have you been doing regular tune ups on it???

clean the air filter??

as far as i've seen on here the chips dont really work to well on the montes

 

I am running the original plug wires and coils. Would a new oxogen sensor make a performance difference?....Regards....Tom H

 

i would change plugs, wires, fuel filter, clean the air filter, and a clogged 02 can affect performance a little, burns a lot more gas if its no good

 

OMG..I am still running the original fuel filter also...lol.....I'll change out all the mentioned items and get you some performance reports afterward wiz kid...Thanks for your input...Regards....Tom H

 

and if you can do it yourself all the best, shops will take you to the cleaners for labor on small jobs like this

 

Wait a minute, you said that your son installed a K&N filter outside the factory box filter ? Does that mean that you are running 2 filters? I'm confused.

 

He bypassed the box filter for a K/N filter.......Tom H

 

so he took the box off and put a cone there??? i couldn't figure that one out when you first posted that

 

i recommend an tune-up. on these engines you should only use ac delco spark plugs. depending on mileage, you should replace the wires, pcv valve and all filters that are dirty. it also would hurt to run some top engine cleaner through the throttle body to get rid of any carbon build up on it which could cause a rough idle.