Car making a rattling tic tic noise
I have a 1995 Mercury Grand Marquis GS. Say if I'm at a complete stop and accelerate hard the car sounds great and every thing seems fine. But say if I'm going anywhere from around 35 to 80 mph (I have not gone any faster) and I try accelerating hard to pass a car or to catch a yellow light before it turns red I hear a rattling noise kind of like a tic tic tic. Its not very loud and it only seems to happen when the engine is being force to work hard.
I have replaced the spark plugs, cables leading up to the spark plugs and recently the trans oil and torque converter have been replaced to fix a shuttering problem but this rattling noise already exist before the torque converter was change. Also the check engine light is on and the code P1409 is showing up.