There are a lot of possibilities here. Bad signals from the MAF can "confuse" the computer, causing many possible "reactions." The computer decides which gear to activate in the transmission based on inputs from sensors. It calculates for engine loading, RPMs, road speed, etc. If a sensor gives a reading that is not correct, but not out of range, it can cause the computer to select the wrong gear. This can give the impression of slipping. If the computer selects a higher gear than it should, it can seem very sluggish, like if you put a manual transmission in high gear at 5mpn. If this happens with an automatic, the torque converter is then the only reduction available, so it will rev up to stall speed without making the car move as it should.
There is also the possibility that you have more than one problem, in which case the two symptoms may be unrelated.
Start with the problem that is the most important, and then work from there to see if other problems exist.
As with any diagnosis, do not overlook the basic needs of an engine - fuel/air mix, spark, and compression. If one goes wrong, the other two will not matter. Too many people start out by guessing and changing parts. This is an expensive way to effect a repair.
A live reading from several sensors and a fuel pressure gauge while it is acting up would be a big help. If you have a scan tool with this capability or a friend that has one, that would be a good place to start. Good luck.
Sunday, February 22nd, 2009 AT 11:21 AM