My 617 motor has decided to run rough at times... I think it is a fuel issue, so... I replaced both the primary and secondary fuel filters....no change...next I replaced the injectors... runs better when it runs good, but still runs the same rough at times, which is getting more frequent. Starts easy, but idles like crap at times. Pulls up hill sometimes and others I have to kick it down to 3rd, and today it still didn’t pull good in 3rd for the first time. I’ve tried adding some additives, sea foam and another. No changes yet with over 300 miles. The car will still go over 85 mph, as of today when it’s running on all cylinders. Feels like it convulses and is only firing on 3-4 cylinders unless I increase the rpm at idle and by running a gear lower so it stays at a higher rpm.......what should I replace next??? The fuel pump, or clean out the tank and the strainer in the tank? Or something else??.. I’m open for suggestions. Thank you for your input and opinions.... air filter is good by the way.