Bogging down on take off w/ cold engine (Page 2/2) 82-T/A [At Work] MAR 25, 03:08 PM quote Originally posted by Patrick: There is no ThermAC system on an '87 duke. There is an Intake Air Temperature sensor instead. Check for trouble codes. A failing Intake Air Temperature and/or Coolant Temperature Sensor could both affect engine performance, as it's possible the engine is running too lean when cold. A failing fuel pump can also lead to a lean condition, as can a leaking "rubber" hose in the gas tank. Testing the fuel pressure would be a good idea. Although this was for my '84 duke, much of it still applies to an '87... Tried three different MAP sensors, but 2.5 engine still bogs badly when accelerated I had no idea! Good to know...