Hi, I'm on this forum as of today to check out if anyone might have a suggestion for this situation - Any advice or knowledge shared is appreciated. Noticed some hesitation duiring idling, and replaced the plugs, wires, cap, and rotor. The next day it began knocking violently - really sounded similar to a top-fuel getting ready to race (low RPM and pinging like crazy). Checked the plugs, firing order, replaced the plugs and wires with another set, but it's still happening. To note, the plugs I took out initially were burnt white - I am aware this means the engine is running hot, and replaced them (from Bosch Platinum to Bosch Platinum 2), but what caused such a drastic change in performance? Again any constructive response is appreciated. '91 Ranger 3.0L 134k mi.