Ok first the car is a 98 Ls turbo stock motor with 95,000 miles. The car was in an accident so i took the turbo off cause some piping got torn off nothing major. fixed the car and drove it for a while, now the problems noticed one day the acceleration got very slow but
still had ok top end 5k and above. put the turbo back on and not the same as before full boost is like 5k as before it was 3k so thats that, now the car dies at idle sometimes,next
it sometimes doesnt start at all. next sometimes when i punch it in first the rpm gauge will jump all the way till the end and then the car dies. it takes a while to restart. So i changed the distributor, plugs, i checked the grounds, fuses i have fuel presure. i know it has no spark when it dies but then starts after a while and i know my valves are loose maybe thats the lack of power any ideas please. oh and after the distributer was changed it hasnt died but some mournings wont start cause no spark

 

Any CELs?
Have you set the ignition timing?
Have you adjusted the valves?
Have you performed a compression test?

 

no cels and i didnt check comp yet or timing, thats what i was going to do next but what is causing the no spark when it dies and after a while it starts up again can it be some kind of relay or maybe a crankshaft sensor not in the distributor but behind the block or does the b18 doesnt have one

 

Maybe it's a faulty main relay? Idk, but i know that stops the engine from creating spark. Also, do you have a alarm installed?