Car was purchased new back in '02, no real issues until last year when this started to happen, has 67,310 original miles on it. Car hesitates, no acceleration past 35 mph, problem is getting worse. Actron super AutoScanner gives no code/MIL set. No check engine light alert. Car does not shake or make any noises, seems fine except for the acceleration issue. Car has acted odd a few times upon starting, turned it off, restarted and car was fine. Car died once at a stop light but restarted right away. Problem began months ago with just struggling to get up hills, but now it's bogging down all the time. Here is the list of parts I've replaced to try to fix the problem with no effect.

Spark plugs, spark plug wires, PVC valve, fuel filter, both O2 sensors (upstream & down), coolant temp sensor, EGR valve, upper & lower manifold gaskets (lower did have leak & cleaned inside and out, lower injector O-rings, MAP sensor, throttle body gasket (cleaned inside & out), switched out with good MAF & IAT sensors (no improvement).
Checked fuel pressure - ok
Checked Coils - ok
Checked fuel regulator - ok
All this has had NO effect on the lack of accleration.

Any ideas? Any suggestions?

I have four different codes from my 2000 v6 Camry causing my check engine light to be on, the codes are p0135, p0325, p0441 and, p0446. I don't know were to start replacing parts.

Replaced MAP sensor and IAC and replace temperature sensor, had diagnostics done voltage reading is supposed to be between 2.9 and 3.2 and reads .09 and still hesitates after warming up and stops, with vehicle in gear the vehicle wants to die and vehicle is sluggish on take off or dies and then runs fine while going. what could be the problem?

just did a new vlave job and had head shaved replaced head gasket and tested compression but it has started smoking after it warms up and it didnt do it before the valve job?

found egr valve and soleniod where n what is the modulator

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How long should it take a shop to replace the two right rear lower control arms on an 08 highlander

I have a 2000 Toyota 4 Runner. We can find instructions on how to replace it but we can't find pix that show how. Can you help us with that?

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sounds like its more in front of the vehicle then middle or back. started yesterday around 6 and I gotta drive upnorth 3 hour drive and I don't wanna kill my car so was hoping I could fix it or keep it safe and drive able until tomorrow

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I have checked the transmission fluid and it's OK

head lights go offo and on while I am sitting still

someone tried to break into my car and now I need a new door lock.It was damaged most likely with a screw driver. cannot use my ket in it any longer.