I have spliced three different signals from ECU to MSD (Pur), SAFC, and VPC. The SAFC reads correctly, VPC is working well, but MSD tech adaptor acts up. When I first start the car it is working fine, but after I warm up the car and boost it really hard, RPM jumps and stays about 3 grand higher than normal. Any suggestions? Thank you. John

99 SC300 w/GTE/Built Tranny/BPU+++

 

take out the adapter and bypass resistor 109 on the cluster