04 monte s/c

[TonzKnock-G]

I took one for a test drive and when driving normally it was fine. When I got on it maybe about 85-90% throttle it kinda shuddered on a few different occasions. I know its kinda vague but what do you think it could be? A few other things i've noticed with the car was the valve covers and oil pan were leaking. Not a big deal if I can get it for the right price. Any opinions? My bro in law said probably trans related. Something a oil (trans) change can cure? No check engine light either. Since the valve covers were leaking, any chance of oil getting into the injectors? If I have asked a dumb question somewhere along the line, sorry, im no mechanic.

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[SaturdaysGS]

Shudder like misfire? Maybe they put in the cheap-O 87 And it was pulling timing, or possibly needs a tune up. Miles? Maintenance history?

 

[GTPpower]

I would lean towards plugs and wires.

 

[TonzKnock-G]

Wouldnt a misfire throw a code? car has 117k

 

[Bru]

Not always. I've had burned up plug wires that caused the car to sputter and bog with no codes.

 

[SaturdaysGS]

Wouldnt a misfire throw a code? car has 117k

Mine was only under high load (80%+ throttle or in OD converter locked uphill) which I wasn't hitting hard enough for it to trip the light.

I would guess at that mileage if you noticed the valve cover leak and didn't mention about new spark plug wires that it probably has original shit in it.

 

[RICH17]

Couple of things to address

How long has it been sitting? Could be bad gas and run shitty at higher RPMS or a sticky injector.

How does the trans fluid look and smell?

Mileage? Could be plugs and wires like people have said.

 

[slowchevy]

x2 on checking trans fluid.

 

[02BlueGT]

Couple of things to address

How long has it been sitting? Could be bad gas and run shitty at higher RPMS or a sticky injector.

How does the trans fluid look and smell?

Mileage? Could be plugs and wires like people have said.

x2 on checking trans fluid.

Replacing the trans fluid has never fixed a 4T65E!!!! If you can feel it, it is already too late and the trans will need to be repaired. Many other issues can feel like trans issues though (Like TPS issues causing it to shift at random speeds/ not shift)


Back OT, With the other posters, High RPM top misfires are commonly caused by worn plugs/wires. Start with the simple shit.

 

[Freebeer187]

I had a cracked spark plug that threw no codes and only started to act up over 60% throttle. Ran like shit past 60% but before if you weren't hot rodding it, the car drove fine.

 

[RICH17]

Replacing the trans fluid has never fixed a 4T65E!!!! If you can feel it, it is already too late and the trans will need to be repaired. Many other issues can feel like trans issues though (Like TPS issues causing it to shift at random speeds/ not shift)


Back OT, With the other posters, High RPM top misfires are commonly caused by worn plugs/wires. Start with the simple shit.

I didnt say to replace it. Just to smell and see how it is. It could be a trans slipping issue