Hey y'all! So, my s80 t6 has 160k, and i love it, but i may seem that death will part us. Lately, while accelerating in first gear right after being stopping at a stop sign/light, the car will shudder violently. Its occasional. Also, while a cruising speed, sometimes when I step on the gas, its like the car doesnt want to accelerate. Acceleration will sound rough, and not be peppy. Like it reluctant to go faster, even tho I am going 60mph. ANy ideas? I was thinking ECM?