Starting issues

And it started and idled fine before the pump changes?
I would still check the timing chain slack.
Well, kind of. It idled and revved fine in nuetral, but idle in gear was kinda rough, and half throttle was a pure nightmare. Cold starts were iffy but the choke was disabled for various reasons. There is some slight timing chain noise, nothing horrible but it is in time, and hasnt jumped (yet lol).