I have a 1995 s10 with the CPI engine and a 5 speed. My truck is acting like it has a redline at 3700 rpm's when driving but if I stick the clutch in and rev it it will rev all the way to 5500. What is the deal here? My only guess is fuel pump. I changed my fuel filter about 2000 miles ago. I cleaned the injectors last night and flushed the engine. Any ideas guys?