86 SDL RPM hits a wall

For no reason at all I have no throttle response it will get up to about 1000 RPM and hit a wall. It wasn't like that yesterday. I have new injector nozzels balanced clean hard lines new filters (pre-filter is the aluminum filter I got here) diesel purged. the only thing I did was install a trans vac. modulator (shifted hard and held no pressure)in anticipation of the manual to come out but after that it reved shifted not really better but atleast it was drivable and today I get about a whole 2-3 mile and hour and even moving the linkage by hand same thing so it's not a toyota "floor mat in the way" thing all my linkage is moving sooo what's up thanks in advance.

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