If I floor it when it's running it will bog down then catch add run only over 5000 RPM up to red line, when I let off the gas it sounds like it's dying but then picks up and had a smooth Idol what if I given enough gas to go over 1250 rpms it died immediately when it hits 1250 unless I floor it all the way and then I have that window between 5000 and red line. Does anyone have any idea what this would be? Thanks