PaulHuntzy

So I’m hoping I can get some help with my 97 c1500 350 shorty. Under regular driving condition the truck runs and drives perfectly fine as it only has 64k miles. But in first gear with the pedal to the floor the truck feels like it’s holding back a lot of power until it shifts into 2nd gear. The rpms rise as they should and I don’t feel any hesitation or missing. Any suggestions?

Hi everyone, asking a question for my Dad so please excuse my lack of knowledge. He recently had a Whipple Super Charger and Kooks longtube headers installed on his 2018 GMC Sierra 1500 with a 6.2l. We can defiantly tell there is power missing that a proper tune should correct. Is taking the truck to get dyno tuned the only option? I believe he has a diablo sport hand held tuner with the onboard gauges on screen but was told that he cannot use it. Also after picking up the truck today from the shop the gauges started acting funny and gas gauge started to read empty. Plugged in a OBD2 scanner and theres a few check engine light codes for maf sensor and o2 sensor. All help will be highly appreciated!