I took my truck into tune-x to get my truck at its peak before heading off on a business trip..Since then my truck have had a EXTREME loss of power..It even dropped me to 8MPG, i got 10 if i was lucky..I put on my new magnaflow exhaust kit and that boosted my mpg by 2 but still, no performance gain..I have tried everyting i can think of so far..Has anyone experianced this?? I am in a 98 dodge ram 4x4 5.9..Any suggestions on what this might be?

 

What did they do to it at Tune-x? Do you have a bill that has any info on it? [&:]

 

i have been trying to find the bill from there...I saw them put in a little square black chip, went in the left side of the engine..I havent been able to find out what it was..

 

i used to be able to spin the tires, now its like driving in a minivan.

 

Did it start doing this RIGHT after they worked on your truck? If so, then you're going to have to figure out what they did. Maybe go back in and ask them. They could've done anything to it. I can't imagine what they would've done that would cause you to lose power though. [&:]

 

The computer is on the firewall on the left side of the engine if you are looking at it from the front. I wouldn't THINK they would have replaced the chip in it......but who knows. You need to find out!

 

i think it actually might be the o2 senser...Would that have alot to do with a loss of power?

 

A bad O2 sensor would give you a "check engine light". If they replaced a bad one it should run better, not worse. Go back to that place and ask to see a copy of the receipt. They should have it in their computer. THEY should be responsible for finding out why it runs worse AFTER they SUPPOSEDLY tuned it up. Something sounds fishy here........