horsepower reading

Anyone who might have some experience with this sort of thing, I have an 87 L6 that I have been working on a bit. I dyno'd the car 26 Sep 08 and my high reading is 134 at 4800 RPM. There are no known performance issues and I am meticulous on the upkeep of this car. I installed a performance chip a year or 2 ago that I purchased from Bavarian Auto Sport. The car runs fine mileage is ok but acts like it loads a bit when started. I have new 8mm High performance wires new distributor and parts. Any ideas where I may start looking? Anyone having experience with something like this, I would like to get advice. Thanks0