Make sure you check the fan circuit. Domt assume a lean condition will cause the fan to not run. Could be a fuse or relay or even just a bad fan. The blue tail pipes are a good indicator of lean fuel mix though.
For the fan check the fuse and if thats working unplug the fan and run the 2 wires that it should have to a 12v source like another battery to make sure it spins up.
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