Hey, I am having this exact issue on our scag with the same engine. I originally had a code for coil #2, put a new one in, then a couple of days later had a code for both 1&2, put a new one in #1 and am now getting a code for both. Same deal, runs fine for a while then bogs down and shuts off when putting the mower blades on and/or going up hill. Our local dealer is 2 months out. They told me to just start checking the wiring harness for damage. Needle in a haystack situation. Wondering if you ever got anywhere with this. Thanks!