Low charge would e my first guess, but it would just be a guess without looking at gauges. Most systems are set up to run between 25 and 45 psi on the low side. Compressor would cycle off at 25 and restart at 45. Most systems that are designed for R134a also have a high pressure cutout switch located on the high side line. Pressures can get a bit out of hand on systems running R134a.
There is also the possibility that your compressor is running too fast. If your system is set up for mostly low engine speed operation, when you raise up the engine speed, it could be running too fast resulting in lower pressures on the low side and higher pressures on the high side. Again, without looking at gauge readings, this is also just a guess.
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