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Hello i have a 96 buick regal custom it drove great the first month i had it now it feels like its cutting out,driving rough im not sure what to call it chugging but only when its between 40/45 miles per hour wether i drive on an incline or straight away.Im somewhat mechanically inclined,Brake jobs, replacement of almost any exterior engine part,By no means a mechanic but do like to fix my own vehicle if possible.I need help with this issue!Thank you
 

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My first impression of your description is a miss-fire in the ignition system. Probably a bad plug or a bad plug wire. When you are crusing at that 45 speed, the torque converter will go into "lock up" and you can feel these misfires...... Jake
 

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Agreed, that sounds like a misfire scenario. Sometimes, if you open the hood while the engine is running and apply throttle, you can see the wires or coils arcing. I saw this personally once while I was troubleshooting the same behavior. It ended up being a split coil pack in my case.
 

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This is a day late and a dollar short, but I remembered there was a batch of 4t65 transmissions that had a "lock up convertor chattering during slight acceleration or in LOCK UP MODE on an incline. We used to get on a long uphill highway and slowly increase throttle. We found a quick tap on brake pedal unlocks convertor for a few seconds and the chatter is gone til the next lock up cycle. INTERNAL CONVERTOR CLUTCH FAILURE..... Jake
 

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Amazing how faulty converter lock up can imitate performance issues with our engines.
For some time in the past, I had some trouble with chugging , when accelerating around right turns.. I was concerned I was having trouble with fuel pickup in the tank I was never able to emulate the issue..
Later, the stock converter failed after a trans repair. Had car towed to shop, and a converter with 2700 stall speed installed.
NEVER had the problem since.
Good call on this check out procedure Jake.
 
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