Lag/delay in throttle response


New Member
Jan 13, 2004
Detroit, MI
I converted a '66 mustang to fox style EFI using parts from a 1993 Mustang LX 5.0

I'm experiencing a slight delay in throttle response, like when you snap the throttle it almost bogs or delays then takes off, ALSO, when you let off the throttle there is the same delay, meaning the rpms don't drop right away, it seems to hang for a slight pause...

Anyone ever experience this problem?? Otherwise EFI is in and running great!!
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