I'm not sure, but did the IP had a right setup to the engine with the gauge/meter? I remember you can set the pump 180° wrong and it would run, but baaaadly.
I had a few years also a bad setting after I replaced the D24TIC engine and inserted the refurbished pump without having the meter and it ran also bad. Rough run, no power and high smoking.
But in this case it was misconfigured just a few degrees...
Check out the correct setup of the IP!
Greetings,
Bernd
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...D24T(IC) is THE ULTIMATE engine sound in my ears! 
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