I HAVE A 2004 HONDA PILOT, WHEN STEADY DRIVING & THE RPMS ARE BETWEEN 1300&1400 I WILL GET A VIBRATION OR RUMBLE FROM THE ENGINE AREA, ALMOST SEEMS TO LOSE POWER HOWEVER IT WILL GO AWAY IF I ACCELERATE OR BACK OFF THE GAS.BOUGHT NEW I TOOK IT IN FOR THE TRANS.RECALL HAS 117K THE PROBLEM STARTED AT ABOUT 80K TRANS. SEEMS TO SHIFT GREAT JUST REPLACED THE EGR VALVE & THE PORTS WERE NICE AND CLEAN. NO CODES/ ANY IDEAS????