sup guy i have a 01 gs430. i was on the freeway go 65 mph about 2200 rpm than my speed just drop and my car feel like it losing power. than i punch on the gas than it go back to normal again. This happen to me a few time already. So i wonder could you guy help me out.

Thank you

 

I had same problem as well, don't know why, but only on highway cruising speeds...

 

So all of the sudden you lose power at highway speeds with the accelerator depressed?

 

maybe maf or tps?

 

Yeah when cruising at speed, accel at same level.

it's possible for maf or tps, but it only occurs when cruising for about the same speed and mostly if not all only at highway speeds...

 

In that case, im not sure. Does the 430 even have a TPS sensor?

Check the TSB's for that model year.

 

Check your battery terminals, make sure they are not loose. It can also be the fuel pump.

 

I don't think it's battery as alt will still provide power, I've had the terminal loose before, there's no signs for that problem until you try to start the car.

 

yeah i think it the fuel pump too but i dont want to waste any money on it if it not the problem.