Engine knock at high RPM

I have noticed lately that my car is a little sluggish. When I accelerate to high RPMs (3+) the car begins to jerk and I can also hear a metallic knock coming from the engine. I'm not quite sure if this is something to be concerned about.

The car runs really sluggish on acceleration and spurts/jerks a little around 2.5k-3k RPM. It also makes the heavy knock around 3k+ and when I give it lots of gas, the car jerks more.

The car runs really sluggish on acceleration and spurts/jerks a little around 2.5k-3k RPM. It also makes the heavy knock around 3k+ and when I give it lots of gas, the car jerks more.


What year vehicle, engine, mileage etc.

Last tune up??

Is it pinging??

Can you post a video of the knock???

What year vehicle, engine, mileage etc.

Last tune up??

Is it pinging??

Can you post a video of the knock???

2002 Ford Mustang 3.8L V6; 51500 miles

I had a general tune up (fuel filter, air filter, oil change, etc...) a month ago.

What do you mean by pinging?

2002 Ford Mustang 3.8L V6; 51500 miles

I had a general tune up (fuel filter, air filter, oil change, etc...) a month ago.

What do you mean by pinging?

Pinging is the a sound you get when the timing is advanced to far,

Is the check engine light on?? any codes???

Check fuel pressure with a fuel pressure tester gauge.

Does it start right away or does it crank a little before starting???

Hows gas mileage?

Just had fuel pump replaced, car seems to be running good at times with acceleration, but other times it goes sluggish. The car begins to jerk around 2.5k+ I'm still puzzled. Engine light came on, but I can't get it into the mechanic until next week.

New description:

My car recently died and after having it towed to a mechanic shop, I found out that they had to replace the fuel pump. After receiving the car back, I have noticed that my car is a little sluggish at times, especially when the A/C is on.

The car will run really sluggish on acceleration, almost as if there is a major drop in power to the engine. It always spurts/jerks moderately around 2.5k-3k RPM. It also makes the knock around 3k+ and when I give it lots of gas, the car jerks more.

I have also noticed when I shift it into 5th gear (final gear) on the highway, the car won't want to accelerate much over 70mph and the RPM usually hangs around 1.5-2k.

I'm not sure if this is a simple spark plug issue or a clutch problem.

New description:

My car recently died and after having it towed to a mechanic shop, I found out that they had to replace the fuel pump. After receiving the car back, I have noticed that my car is a little sluggish at times, especially when the A/C is on.

The car will run really sluggish on acceleration, almost as if there is a major drop in power to the engine. It always spurts/jerks moderately around 2.5k-3k RPM. It also makes the knock around 3k+ and when I give it lots of gas, the car jerks more.

I have also noticed when I shift it into 5th gear (final gear) on the highway, the car won't want to accelerate much over 70mph and the RPM usually hangs around 1.5-2k.

I'm not sure if this is a simple spark plug issue or a clutch problem.

Do you have a autozone or oreilys close by that can read the codes for you for free and post them her, get a read out slip if you can from them.

Just because fuel pump is new does not mean it cannot be faulty??? Double check fuel preesure. What brand of pump installed???

Is the Intake Manifold Runner Control working, clips on rods ok???