The E cam causes the engine to run very rich at idle. Then the computer will go into fits trying to stabilize. That is why you can give it a vacuum leak at idle and it won't surge.
Or just get an EEc tuner or a custom chip.
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1988 Mustang GT
stock bottom 302, C4
10.9 @ 128 with 8 psi of Novi 1000 boost!----STOLEN
1989 Mustang notchback
Warmed up 306 with a Procharger.
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