My EFI CVH turbo engine idles high, Its chipped by MSD. I thought it was the ISCV, So I cleaned it out and re-fit it. It still happened, So I unplugged the coupler from the unit itself, It then decided to idle correctly.

Next step was to remove the Chip from the ECU, The Engine then Idled correctly, So I re-fit the Chip and it idled back up to 2500-3000RPM. Its off the road until Spring next year now. Any EFi gurus on here that can shed some light?

Ta in advance.