Originally Posted by JimF

That's a good point that Larry made: Low battery in a MB cause many strange things but mostly 'phantom' IC lights. Never seen it run poorly but . . .

I have an 'eyeball' test that has worked well for me; when I go to start the car, pause when you get to ignition-key to postion #2. All IC lights come on; observe the brightness. Now start the car and watch the IC lights; if they dim 'badly', you probably may need to fully check the battery/charging system. A bad/weak cell in the battery will cause this.