I have an 87 SR5 Turbo, My grandpa gave it to me when I turned 18 and I really don’t know much about trucks but I was able to keep it going until here lately, I have to keep my foot on gas when idleing to keep it running, and when I put it in gear it doesnt want to go anywhere, it will really slowly and it does it thru all gears and tops out at 40mph. It barley started shutting off on me after I get going a little in first gear. Any ideas or help would be greatly appreciated.