[mcdon26]

Ok. As requested I'm starting a new thread. I've seen a lot of people who have had this issue throughout several different forums but no one has ever posted a resolution that I have found.I bought the blazer last September. 4.3l spider injectors had 175k miles when purchased and super clean. Last summer on hot days, and only after driving 15 - 20 miles the engine would start to hesitate on acceleration. The more gas pedal I would give it, thee more it would hesitate and lose power until it eventually stalled completely . I could let it sit, cool down for 30 minutes and it would restart. This happened 4 times last summer on hot days and each day it was back in the shop from where I purchased it. Fuel rail pressure is always good. Leak down test was done on the fuel rail and it held. The only code I would get was an intermittment small evap leak. Fuel filter was replaced. After several revisits to the mechanic he replaced the ICM (supposedly), then we entered the fall season, the weather cooled, and I never had the stalling issue. I did however sporadically get the small evap leak code come up when I was always below a half tank of fuel. I'd fill up and and next diagnostics cycle the SES would go off. Fast forward through the winter, no problems other than sporadic SES WHEN UNDER HALF TANK. motor was replaced 2 weeks ago with a new one. 500 miles on the motor and we had our first 80 degree day here in Maryland. Blazer started fine in the morning and starting fine in the afternoon. In traffic, and after sitting at a stop light for a few minutes the problem restarted. No SES light. From a stop gave it gas, it accelerated fine until I gave it more gas pedal to accelerate faster. Vehicle hesitated badly so I backed of the gas and it felt normal. I had to keep backing off the pedal to keep it from hhesitating until it final stalled completely. Had to let it sit for over an hour. Check the fuel rail and it had pressure. I couldnt tell exactly as i had no gauge. Turn key back on and pressure built back up. It hesitated and was hard to restart but ran for another 4 miles before doing the same thing again. Let it sit two hours restarted and got it home 5 miles away. Although I still got no. SES light I noticed a discoloration on the ignition coil and replaced it as well as cleaning out the MAF sensor in case it was dirty. But again no codes. This morning started fine and I'm now sitting at the shop. This never repeats itself for any mechanic. Just likes to leave me stranded. Thank you in advance for your help.