So here I go again,
After finding out that the haed and the valves were gone for this car, I went and purchased a running motor, Yes I did see and check that it ran fine before buying it.
Got the engine replace and now I have this new problem.
I hooked everything back and started the car, it idles perfact but when I try to press on the gas padel, it starts hesitating and sounds like it is drawing too much air. Checked all the vacuum lines and everything looks fine.
Things I have done...
I have changed the distributor,
Fuel filter and fuel pump.
All plug wires and do not understand why it is doing that.
The engine ran fine in the original car.
Please help, if any body else ever experienced anything like this, or similer symptoms.
Thanks.

Is the engine identical to the one you had before--same engine number and year?

Yes it is, same year and engine type.
D15B7

. Check the hoses to the Idle Air Control Valve (IACV).

Try removing and cleaning the IACV, throttle body, and throttle plate. This link should help:

https://www.askmehelpdesk.com/cars-t...ml#post1054149

. Ensure the PCV Valve and hose are fine.

. Check intake manifold for leaks.

It idles fine, I was under the impression that you need to clean the IACV if there was problem with idling.
I will try it anyway. All hoses are in place and no leak from the intake.

You are correct. I mainly wanted you to check the IACV hoses. However, the procedure for cleaning is so simple why not?

Since you replaced the distributor, the timing may off. This is likely the problem. Here's how to check the timing with a strobe light:

https://www.askmehelpdesk.com/cars-t...tml#post219963

If you don't have a strobe light, slightly loosen the three mounting bolts and rotate the distributor counterclockwise, to advance the timing. This will allow you to set the timing by ear, if done while the engine is warmed up and running. Performance and sound will let you know when it's close.

All right, I just found something that may be the cause, but doubt it.
I rechecked the engine type and turns out that the one I got in now is D15B and the one that was there was D15B7.
I don't think that it should make a difference. The year however is the same.
Your thought.
Checked the timing and it is fine, also checked the O2 sensor and replaced with another.

Look at the actual number on the engine, located just to the left of the exhaust manifold shield.

Yes, that is where I got it from. It is D15B.
No number after the letter B.