Car Information:
Lexus ES300
Year: 2003
Engine Size: 6 Cylinder IMZFE
Trans: Automatic

Issue/Question: Our car has what I would call a “stumble” under acceleration that is very intermittent. It seems to do it as we leave the house in the morning and will do it at speed on the turnpike. I thought at first that it may be bad gas but using premium did not help. At this point it is just an annoyance, but we want to get it fixed. Sometimes it will go for miles without doing it. Will the onboard computer tell someone with appropriate diagnostic equipment what is going on? Any idea what it will cost to diagnose and fix? I appreciate you and what you do. Thanks.

Answer:
It’s possible the problem is an intermittent misfire. If that’s the case, it will require a good old fashion tune, plugs, coil insulators, throttle body, and MAF cleaning. Now if it has an ongoing misfire, you’re right, it may show up during a computer scan. I feel it’s a tune up issue because these engines have very few other problems if the oil services are performed regularly.

Magic Mechanic
1432 Lee Road OrlandoFL32804 USA 
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