All stitches skipping and i replaced the needle

Make sure you are using a brand new needle. A damaged needle will frequently cause skipped stitches. (Changing the needle is the least expensive repair for machine problems!!!!)

There is a lot of information available on the internet.

Basic Maintenance Tension Skipped Stitches

What to Do If Your Sewing Machine Is Skipping Stitches

10 reasons for skipped stitches

Be sure to use a brand new needle. If the needle is bent or damaged, it will frequently skip stitches. Also, if you are using the incorrect needle for the fabric & thread you are using, it will skip stitches, ie a ball point needle on woven fabric.
All About Needles

Basic Maintenance Tension Skipped Stitches

What to Do If Your Sewing Machine Is Skipping Stitches

10 reasons for skipped stitches

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lower your needle. If up to high can't catch the bobbin thread.

Skipped stitches
1. A bent or dull needle
2. The wrong needle for your fabric
knit fabrics require a jersey or ballpoint tip. Most wovens do well with a universal tip, and specialty fibers, like leather or metallic, usually require specific needles.
3. Incorrect machine threading
4. Unbalanced needle thread tension
Start by making relatively small changes and run a test stitch to evaluate the impact. If you need to adjust the tension dial using woven cotton fabric with good quality all-purpose thread and a new needle
5.check the needle is inserted correctly. The needle needs to be pushed as far up the needle shaft as possible. It's easy to insert the needle half way, clamp it down and think it is inserted correctly.
the flat part of the needle should be positioned towards the back. If the needle is not inserted correctly, it will not be able to pull up the bobbin thread and will cause skipped stitches.
6. If the suggestions don't help then it is time for a tune-up.

Skipped stitches

1. The needle is not inserted correctly

Remove needle & reinsert needle( flat side towards the back of machine)

2. The needle is damaged

replace with new needle

3. The wrong size needle is being used

Choose a needle to suit the thread & fabric

4. The foot not attached correctly

Check & attach correctly

5. If the above suggestions don't help then the machine needs to be checked

For a timing problem.

Skipped stitches
1. The needle is not inserted correctly
Remove needle & reinsert needle( flat side towards the back of machine)
2. The needle is damaged
replace with new needle
3. The wrong size needle is being used
Choose a needle to suit the thread & fabric
4. The foot not attached correctly
Check & attach correctly

SKIPPED STITCHES ON A SERGER
1. Is the needle bent or worn--replace
2. Is the needle inserted correctly into the needle holder--check needle
3. Is the Serger threaded correctly--rethread
4. Is the presser foot pressure right for the fabric--adjust

Skipped stitches

1. The needle is not inserted correctly

Remove needle & reinsert needle( flat side towards the back of machine)

2. The needle is damaged

replace with new needle

3. The wrong size needle is being used

Choose a needle to suit the thread & fabric

4. The foot not attached correctly

Check & attach correctly

it's also possible that the machine could be slightly out of time

the needle bar is not hollow,
Skipped stitches
1. The needle is not inserted correctly
Remove needle & reinsert needle( flat side towards the back of machine)
2. The needle is damaged
replace with new needle
3. The wrong size needle is being used
Choose a needle to suit the thread & fabric
4. The foot not attached correctly
Check & attach correctly

You will need to take your machine to a dealer and have it adjusted. Machines should be cleaned and serviced at least once a year. Needles should be replaced when dull. Skipping stitches can also be from using the wrong kind of needle. When quilting on cotton, use sharp needles, when sewing on knits use a ball needle. You can use a universal needle but they aren't perfect and will cause skipping on some fabrics.