I have a 98 ta with a ls1, typical heads, cam, and bolt ons. It idles fine in gear but not in park or nuetral. I flashed it to a 6speed car since it has the turbo 350 in it. What do I have off where it idles in gear but not park. It surges in P but not in gear.
When I put a th400 in my camaro it idle the same in g or p after the swap.