Having trouble with power. Seems that the turbo gauge is sometimes working and sometimes it's stay in the middle. I had recently replace the fuel pump, ECU, injectors and pressure regulator. I still have some power and improvement, but still lacking in the turbo department. Just wondering what I might want to check now? The O2 sensor doesn't seem to fluctuate on the voltage as it's always reading high on voltage. I have always use a light to adjust the AMM mixture. Anybody ever have similar problem. I was thinking about a compression test and timing mark check to see I the timing belt slipped, but I doubt it.