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Chevrolet Repair/1997 tahoe loss of power between 40-65 and vibration

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Question
Tahoe has loss of power and vibration thru the cab. drove it and felt like something wrong went to see if any codes popped and a low air volume code, looked and the maf was unplugged. Plugged it back in and it died when going into reverse or drive. Changed MAF and it was fine but now i sputters sometimes upon stopping and going. Went to have codes ran again and it was showing 601,603 and 607. Chevy cleared the codes and they have not come back but the powerloss and vibration is getting worse.Between 45-60 rpm around 2-2 1/2 no power. changed everything i can think of, o2 sensors, cap, rotor, plugs wires, maf. Starting to think it may be in the trans. I also put a new exhaust system on it which has no cats and its reading lean codes but i can understand that with no cats. Any help would be greatly appreciated. Thanks.

Answer
HI JEREMY,WELL THE PO 601.603 AND 607 ARE ALL CODES FOR THE ECM NOT SEEING THE THROTTLE RESPONSE LIKE IT WANTS TO..THIS COULD BE WHY THERE IS LOW POWER.THIS PCM MAY HAVE A PROBLEM STARTING OR THE IT MAY NEED TO BE FLASHED TO UPDATE IT..I AM SURPRISED YOUR CHEVY STORE JUST CLEARED THE CODES AND NOTHING ELSE...AS FAR AS THE VIBRATION GOES THIS COULD BE FROM U-JOINTS STARTING TO LOCK UP..DOES THE VIBRATION ONLY SHOW UP UNDER THROTTLE RESPONSE..WHILE COASTING THE VIBRATION STOPS ??? IF SO REMOVE THE DRIVE SHAFT AND SEE IF ANY OF THE U-JOINTS ARE LOCKING UP,, IF SO REPLACE THEM AND THAT WILL TAKE CARE OF YOUR VIBRATION... DO YOU FEEL IT THROUGH THE ENTIRE TRUCK OR IS IT JUST AT THE STEERING ?? GET BACK TO ME IF YOU WANT TO ON MORE INFO ON THE VIBRATION. GOOD LUCK, ,TOM

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TOM SHEETS

Expertise

PLEASE READ ALL OF THIS BEFORE ASKING ANY QUESTIONS. IF THIS CHEVY SECTION IS MAXED OUT.YOU CAN REACH ME IN THE OLDS/BUICK SECTION. Will answer questions from 6:00am to 10:00pm all days [EST][[[ NO DIESEL OR PAINT QUESTIONS]]] will answer all 1965 to present QUESTIONS ON ALL GM'S on mechanics of these cars. Keep in mind i am not there in person i am going on what you are telling me !! PLEASE IF ASKING A QUESTION GIVE ME AS MUCH INFO AS POSSIBLE. THE MORE THE BETTER. SUCH AS YEAR,MAKE,MODEL,ENGINE SIZE. THIS WILL HELP ME HELP YOU. I will not be able to answer all questions because of some situations that i would really need to be there and see things for myself,such as electrical issues. In many cases i would need wiring diagrams. I can also give you an estimate on what the cost would be at our repair shop as an idea to help you. Keep in mind that my answer is ONLY MY ADVICE,ck with your mechanic as well.. >> THANK YOU, TOM..

Experience

I have been a ASE certified master mechanic for over 30 years and certified IN ALL 8 CATEGORIES,[engine repair,engine performance,auto trans,manual trans,clutches,steering and suspension,brakes,electrical systems,heating and air/cond. I am also a state CERTIFIED inspector for over 30 years. I do computer work [pcm]fault codes,pcm flashing,state inspection monitor readiness,repairs on exhaust,fuel service,[injection and carburetor,] charging system problems, running issues,alignments,frame problems,tire balance,struts and of course standard and anti-lock brakes.

Organizations
nys state auto repair industry and ase group.

Publications
N/A

Education/Credentials
high school,4 years of tech school,and many many hours of auto training with many gm classes and aftermarket training classes..

Awards and Honors
ASE MASTER TECH CERTIFIED IN ALL 8 CATEGORIES.NYS INSP LICENSE AND A/C CERTIFIED

Past/Present Clients
MANY CUSTOMERS IN OUR BUSY SHOP.

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