Ok, so i got this brand new 3.8 put in my 94 LX. It has about 16000km on the new motor. Since then, I put a y pipe on and eliminated the muffler. This motor has never run without my K&N. Anyways, I had this rattle.. it was the heat shield on the cat, so i welded it back. Now, i have like a fluttering kinda sound. I thought it was the heat shield again, but i just checked it, and they are both solid. Now I'm wondering if it's the valves.. Is there enough backpressure without the muffler? I still have the resonator on it. My heads have not been re-torqued yet, should that be done? Another problem is that sometime, only when the engine's hot, my oil pressure drops. Today it dropped so low the light came on. But it only drops when you put it in gear with your foot on the brake and leave it there. As soon as you touch the gas, all oil pressure comes back. Last time I had my oil pressure drop was because a rod blew and i needed a new engine. And then there's my tranny... somebody said it's the torque converter, and i should do a complete tranny drain. It shudders in second and 3rd, vibrating a lot. So, there's my problems. Can anyone help?