Sean Buick 76
I'm Awesome
No you are wrong the timing being off would cause crap performance plus you have an exhaust restriction issue by the sounds of it.
1. Remove the catalytic converter and run open exhaust from the Y pipe till you can get it running right. Your description sounds like a clogged cat.
2. Set the valves properly, it doesn’t sound like you know how to do it properly so either learn or pay a pro.
3. Set the timing properly.
If it still doesn’t run right then complete a compression check on all 8 and report back.
1. Remove the catalytic converter and run open exhaust from the Y pipe till you can get it running right. Your description sounds like a clogged cat.
2. Set the valves properly, it doesn’t sound like you know how to do it properly so either learn or pay a pro.
3. Set the timing properly.
If it still doesn’t run right then complete a compression check on all 8 and report back.