1990 Suburban 3/4 ton 350, th400 So I have a problem with a stutter or a backfire (Cannot tell while driving). So far I have noticed, -Miss/backfire/stutter under load does this randomly. -TERRIBLE gas mileage -Rough idle sometimes? -Slight miss at idle -sorta hard starts, what I mean is it takes about 4 seconds of cranking to start...Goes away when warm. -revs increase when when pressing the brake pedal -Exhaust does not smell normal (I cant describe it, but its not right) -SES came on and off a couple times when raining, has not come on since. There is also more I have noticed and just can't remember off the top of my head. What I have done to test this, I have searched for loose connections, noticed at the CTS there is a torn wire right before the connector. The wires are still intact, break is so close to the connector I have to go to junkyard to grab a new one. Not sure if it is causing the problems. I have also tried searching for vaccum leaks with my propane torch and hose, did not work...Going to pick up some spray to look more in depth. I was curious is there a way to test the CTS lines after I get a junkyard connector to replace my bad one? Basically I think my problem is one of three things or all of them: -Vaccum leak -CTS Sensor -Fuel Pump Am I in the ballpark here? Open to any suggestions, I am waiting on my new parts for the brake lights and just kind off puttering around.