I have a 1974 Challenger with (340) air gap intake with a 650 proform cab. The car starts and run perfect at first however once I've been driving the car for 20 min my car gets a High idle in stop and go traffic?? If i turn off the car and start it again the high idle will temporarily go away but comes back. Any ideas?
https://www.proformparts.com/produc...50_CFM_b_MECHANICAL_SECONDARY/category_id/182
https://www.proformparts.com/produc...50_CFM_b_MECHANICAL_SECONDARY/category_id/182