I started my truck (78FJ40, 2F) Five times only to hear it roar to full throttle every time. (The linkage for the butterflies somehow were incorrectly reinstalled, leaving them wide open ). I immediately shut it off after each start. The motor ran STRONG before this incident.....it has between 47,000 and 147,000 miles on it, no knock no smoke prior to said incident. This is even more troubling to me being that I know how these motors SHOULD NOT be run at high RPMs, let alone full throttle startups. I heard no knocking or smoking, but man did it feel crummy to hear a 2F run so fast.