I have this 92 Surf 2.4 TDI Aut. ANyway, sometimes, even when she's warmed up, I am finding, that crusing along, around 55 -60MPH ish after about 2 or 3 miles it's although, she is holding back a little. It's not running smoth and even. not so much missing firing, but it's almost like it's starting stuggle a bit. I change down and boot it. This appears to have some effect on it running Ok again. Odd, any ideas.
I have had all the warterways, done, new thermo, flushed right out, new water, antifreeze, and temp wise it's sits spot on.

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