Hey guys, new to the forum. Hope I can post a question here. I bought a maxima with vq20de engine, think the timing chain jumped. Anyway, almost al valves bent. I replaced all the valves, new gaskets, new tensioner enc. Tried to start, no spark, replaced crank sensor on transmission side, now it starts up and idles, but will not rev up. Flipped the throttle plate by hand and still nothing. Not even a diffrence in rpm. Sometimes it gets a slight hesitation and two or three light backfires in intake but no changes in rpm... Any help will be appreciated. It is a manual transmission