Roush 511 problems

[Rick Parker]

All currrent OEM cars utilize some sort of fuel injection since it is controlled by a group of sensors and a computor. It generally does a good job and emissions (the original reason for EFI) are kept low and drivability is very good. It sounds like the computor is losing it settings or a sensor is going bad and sending varying information that the computor is making adjustments for and ultimately affecting the drivability as you have stated. Start with the sensors, check the values when cold and hot, then move to the ECU.

[Maricopa]

I'm not anti-EFI I'm just relating what I've seen with fairly radical street motors and that is that these trick EFI systems often don't seem to work all that well, or at least not without a lot of fussing with them.
Car makers all run modest cams (some with variable timing) and have bazillions of dollars (or at least used to )to get all the bugs worked out.

Hope you get it figured out, it's a beautiful car and I'd like to see it out at the AZ Cobra meets.

[oleyellar]

Take it to Bob Rheam at B&R Automive at 25th Ave. and McDowell. He can diagnose the issue and fix it.

[csx4910]

Thanks for the suggestions. Bob actually was the one that it went to last time. I have heard he is one of the best. I hope to get back out on the road soon to meet some of this this fall at the gatherings.
Thanks