ISLex300

second that.... make sure you inspect all the hoses going to your intake manifold... Ok - i'll double check them. I looked once before and everything looked good. Would a loose hose be the cause for the check engine code I got (P1120 - Accelerator Pedal Position Sensor)? Also, if it were a loose hose, wouldn't the problem be a little more consistent? Basically, everytime I turn the car off and back on, it will drive fine for a few minutes, sometimes even the whole trip, but then just like that the engine will bog down and I have to depress the accelerator all the way down in order for the car to move...could it be a bad TPS? Thanks again for your input!

Thanks! I'll check that out and see hopefully that works. The problem has been consistent over the past two weeks - the car runs fine when cold, and once it heats up, it starts with the hesitation and the accelrator pedal problems. I'll work on those items and post the results. Thanks for your response!

Hey guys, I have a 2001 IS300 with about 185,000 miles. Recently, I have started having issues with acceleration. First thing in the morning when I start the car, it drives great and normal. Then after about 25-30 mins, the engine noticably bogs down, and when I push down the accelerator, the cars does not react. I have to push the pedal all the way to the floorborad in order for the car to move. Also when this happens, the RPM"S shoot up to around 1500 when in Neutral. I changed the O2 sensor as I wire had come loose, but that did not fix the problem. The check engine and trac lights are also on; the code i get for the check engine light is P1120. I have cleaned the MAF and throttle body, and no results. Any thoughts??? Thanks for your help!!!