HopHead357
I'm Awesome
I have a '99 K1500 5.7L with a NV4500 5 speed manual transmission that I swapped in about 2 years ago. This issue started with the old 4L60E that was in it before. With the 4L60E at about 10mph and 1500rpm, the truck would stay at 1500rpm and continue to drive at 10mph with my foot off the gas. Now with the NV4500 when I go to stop at a light and engage the clutch and take my foot off the gas the truck stays at what ever rpm it is at any where from 10-30 seconds. this doesn't happen every time I drive it, maybe only about 10% of the time. When I go to shift and engage the clutch and take my food off the gas, it will rev up by itself about 500rpm, this happens about 50% of the time. Any idea what the problem could be, maybe a bad IAC valve? Any help would be much appreciated.