Does the engine run badly while idling at 5 miles an hour?
Yes rough
in that case i would check your spark plugs, ign wires and ign coil. i'm guessing one of those is faulty and past a certain speed cannot keep up with the spark
Would that stop it from accelerating
While acceleration the rpms will drop to 0
yes it would. you could also have a clogged fuel filter, fuel pickup screen, or a bad/malfunctioning fuel pump. i would recommend going to autozone and getting a fuel pressure gauge and checking that out if replacing spark plugs and ign. wires does not work
go out and get a fuel pressure gauge and check your pressure. if it's not around 35 psi then look at a malfunctioning fuel pump. that's probably the most likely problem
I changed the fuel filter first then the mass air sensor
What about the throttle position sensor
i gauruntee then that it is your fuel pump. considering it's a lexus it may be pretty pricey like my land rovers fuel pump, but you may get lucky. also try putting some fuel injector cleaner in the fuel tank and running it for 10 minutes. if the idle starts to pick up as the cleaner runs through the system you have dirty injectors
i really doubt it. if it was your throttle position sensor the car would idle fine or be too high and then start having worse problems as you drove it
May add I just went to emissions the before this started and I passed
What about the cats
I asked about the throttle position sensor because when I start the car it will idle high and the rpm will be at 0 then jump up then when I attempt to drive it will go stop
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