2004 GMC Sierra Parts Vehicle

Peace be upon you and God's mercy and blessings. I present to you a 2004 GMC model, my father's truck that we've had for a long time and used regularly. The engine has never had any issues except for one thing: when the temperature reaches halfway in summer or during the day, if I slow down, it shuts off. We tried solving the problem but couldn't fix it. However, the air conditioning works perfectly, and the cooling is excellent, God willing. The reason for selling is that we no longer need it. The engine runs well both short and long distances; we frequently drive it from Riyadh to Al-Qassim, and everything else about it is fine. I accept trade-ins, such as a Ford or a small engine, for parts.