So this sounds like a somewhat familiar issue, though mine is an extreme case. I purchased this 2006 vulcan nomad 1600 with 26,000 mi, fully stock. It ran fine when it was cooler out, though no rides further than 40-50 mi. Once the weather heated up I went on a nice slow 10 mi cruise, running about 20 mph through some parks, fan turned on. Went onto a 2 lane rd and got up to 60mph and cruised approx 5 minutes in 4th gear. When I twisted back on the throttle to accelerate to 70 I thought the bike ran out of gas, it had nothing but a sputter, but didn't die. It did this any time I got the rpms up and had to limp back home doing 55 in 5th gear, couldn't t crank it past that. Did the resistor mod, same issues. Checked and cleaned throttle body, same issues. (They were clean FYI) removed resistor mod and installed a cobra powrpro, same issues. Removed powrpro and now I have an FI light on constantly, it had never illuminated before, but bike still runs identical. If I hop on the bike, it rips just fine until it really warms in traffic or just sitting. Before going to the dealer (they can't get me in for 2 weeks) I thought I'd ask ya'll. I am still getting power at the temperature control sensor plug, and I made sure vent hoses were good, even put my mouth on them and blew to make sure they were free and clear. I'm at a loss boys and girls.