Have a problem that I can't figure out and would love some advise. Have a 99 regal 3800 and it has about 135k miles. It runs purfect except when I go uphill at about 50mph, then the engine will begine to sputter or cut out and come back quickly. You can watch the tach jump. If you speed up it does fine or at higher speeds it doesn't happen. I have tuned it up, replaced the fuel filter, and cleaned the throtle body. It is not giving me any SES codes so I have run out of ideas. Has anyone else had this problem and found the solution?


Thanks!!