[Geneman]

hello braintrust. on a 74 RSR race car i am chasing down a huge power lag/ miss .. which seems to kick in after driving a few track laps..... seems like something is heating up . or maybe being blocked. still cannot yet tell if this is a fuel issue or an ignition issue.

this is a 3.0 SS high comp. race motor by knightrace, 50mm PMOs, Bruns twin plug dizzy, twin older 6AL boxes, brand new blaster coils

i was heavily leaning towards fuel because i had found a mouse nest in the fuel cell ( not kidding), which had chewed up a bunch of the foam. but that was fixed. fuel pump good ., showing 3-5 lbs on the dial, good sight levels in the glass windows. idle jets clear.

i am using one of the tach output wires to connect to the AIM dash./logger system and it seems to be giving intermittent signals. at least on the dash and in the video.

can anyone tell me a good test to distinguish a fuel from an ignition problem? can i test each box separately . what would be the symptoms of a box going bad.?