I have a 1996 Chevy K1500 305 automatic with a rebuilt motor and tranny, the truck has 203,000 miles on it and the motor and tranny have about 40,000 miles on it. The truck was running fine until the other day I started it up and it had a miss so I scanned it with a liitle Actron pocket scan and it read p0300 random misfire a mechanic friend told me I probably needed to replace the spider fuel injection so I spent $400 replacing that and it did no good whatsoever , please help I need my truck, the miss is so bad I cannot drive it. please resond