I've serviced and driven dozens of 'em. They all are "low torque breakaway"....because of low stall rpm of torque convertor. 2200 rpm stall.
217 hp and 230 tq. Not a lot for a heavy car but lively over 4000 rpm.....noticeably so.

My old 124 3.0 with 170 hp would have beat it to 20mph, barely.

Engine breathing is optimized for 2k to 4k rpm cruise speeds. What you can do is watch the O2 on a scope. At WOT the O2 shpuld stay up near 0.850 to 0.975 vdc or so.

At idle or cruise it should cross over 0.050 vdc often.

Here's a vid' of a WOT to 80 mph in real time.....yours like this ?

https://youtu.be/2CoB-TnlXvA




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