What could be reason car wont start after replacing various parts? on 1997 Buick Park Avenue

Car started losing power while driving. It'd take a while to start back up. Replaced starter, solenoid, throttle position sensor, had alternator tested & replaced the 3 coils to ignition control module. What could be possibly keeping it from starting? Its like its not getting a spark. PLEASE HELP!

Asked by for the 1997 Buick Park Avenue
1 answer 1 comment
check for spark and fuel pressure ...also scan test for codes
Already tested for pressure. There is no spark. Already scanned for codes. I read about cam shaft sensor. Would that have anything to do with it not getting a spark? I was also told that it could be fuel pump/ or relay. Im going broke trying to fix this.