The noise is from the airflow going over the new "Cabin Filter" unevenly. Pull the filter out, flip it over and re-insert it. This should fix the noise problem.
Check the fuel filter, it might be clogged.
The blower motor speed resister is burned out.
Did you replace the fuel filter? Sometimes a partially blocked fuel filter will present itself as a bad miss at highway speeds.
I was considering a Lexus RX400h when I realized that it was very inefficient at freeway speeds 65-75 mph. Most of my driving is freeway at high speeds. How does the Toyota Highlander hybrid technology work? Is it still beneficial/cost effective at freeway speeds?
Replace the cabin filter. remove panel under dash on pass side.
The transmission may need fluid is the first thing to look at. The next thing is check the filter it may need replaced.
could be the egr valve
Problem is likely the oxygen sensor (located on each of the exhaust manifolds). These are a common problem and can be replace by the average diy shade tree mechanic. 10 minutes each with a cool engine.
The blower resistor should be a diamond shaped thingy on the firewall in engine compartment, on passenger side near the A/C box. there will be an elec connection to it, and two metal screws. just unscrew it, pull it out, replace in reverse order, viola! all the speeds on the motor again. AJ
Fuel filter plugged?Air filter dirty?weak fuel Pump?
What is the roaring noise from a 1999 Toyota Camry XLE at speeds over 35 ? Sounds like it is coming from the rear.
One or both front brake rotors warped.(overheated) take off and have both re-surfaced ("turned") or if beyond 'trueing-up' then replace them both. About 25.00 ea. (new)