I've got the TST comp with the pm3. I keep getting bad surging and the boost will fluctuate causing it to fuel off an on. I can be going 70mph and have 2-3psi on my boost gauge and all of a sudden the TST will start reading 7-14-18-20-30 and so forth pounds of boost then it will go back down to the right reading. My water/meth will read the same (taps into map sensor wire of the tst comp). Has anyone else ever had this problem? It's driving me crazy and the crazy readings happen when on setting zero (0) also.
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