this is weird ok,I usually stay off the freeway if I can,but in So-Cal its nearly impossible,my problem is when i'm going on a straight flat freeway the car has good power,but if the freeway is going uphill my car nearly dies,i'll be going 75 before the incline and half way uphill i'm at 50 at WOT and the car shakes!anybody know what is causing this?Thanks

How old is your fuel filter?

The symptoms sound like fuel delivery, so focus on ruling out the filter (easy swap) and then the fuel pump. A pressure gauge will tell you what's going on.

i changed the fuel filter already,i've only had the car 1year,so i'm not sure when the pump was last changed.sometimes when i start up in the morning it will rev @1500rpm's then nearly stall,then back to 1500 and nearly stall again,but after that it runs fine.also the SES light comes on after about 20 minutes on the freeway,then turn the car off and back on,and SES doesn't come back on.

Let us know what the pressure gauge says.

i don't have a pressure gauge,i'll see this weekend if i can find a cheap one or see if any friends have one.

Check your codes to be sure but this particular order for the light is usually indicative of an O2 sensor. I don't see how an O2 sensor would cause the problems your having, though. Maybe you have 2 problems.

um, maybe its staying in 5th," if u have a 5th?" does it ever have any downshifting problems or anything?

i pretty sure the o2 is bad,i have a very strong gas smell when i turn the car off and bad gas milage.transmission shifts ok,its a little jerky whenever i touch the gas,normal street driving its fine in D,but if i drive around in OD it feels like my old 2.8 V6.could the overdrive gear be worn out?Thanks for all the help

Let us know what the pressure gauge says.

my car has the problem about the SES light its my EGR valve...nothin big and worth replacing...just puts exhaust into ur intake...i dont htink ur SES code has anything to do with ur motor goin up hill...

Sounds like the ignition module is going.