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I'm experiencing the typical intermittant high idle and rough running conditions. The codes I have are 63 which I think is the TPS set too low. I have searched and found some good info on this. However, what is code 98 (Failure Mode Effects Management - hard fault present)? Is this due to...

I'm looking for someone local to do a custom tune on my '91. After I put in the 347 about a year ago it ran VERY lean (~17:1 a/f; 300 RWHP at 5,000rpm). Now it seems (I haven't gone back to the dyno) to be running rich. See additional details in signature at bottom. Thanks, Kevin

1991 LX Coupe (original owner w/ about 92,000 miles) CHP 347 10.5:1 compression Victor Jr. o-ringed heads Crane cam: duration = 232/244 @ .050 lift = .563”/.595” 112 LSA New BBK SSI-Series Intake w/ 75mm throttle body opening 30lb fuel injectors Pro-M 95mm MAS BBK 1 5/8” long tube...

Took my car to the dyno on Thursday. I'm running big time lean so I only did one pull. Also, because of the MSD box the RPMs were jumping all over so I couldn't get a very accurate torque number. Had I done another pull they said they could have changed the hookup for the RPM reading but since...