Car will not accelerate?

Check and test the following below:

Oxygen sensor
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires

You should take it back to the shop and have the fuel pressure checked. Also, check the fuel pressure regulator and make sure the electrical connector, your car may have a vacuum line, is connected.
Still have pressure checked and it would not hurt to have the trouble codes pulled either.

I have had high quality aftermarket pumps fail on me, so it is possible as the first start is kind of tough on the pump. Checking the pressure is the best way to check it and you would have no other reasonable option but to replace it. Also check for anything that could impede the flow of fuel in the line. If you have an inline filter, you do not I believe as the filter is a sock type that is attached to the pump. Make sure hoses are routed properly.

What was the color of the smoke? You sounded like its gonna cost you an arm and a leg. What vacuum modulator is he talking about I hope its not the tranny.

Inbox : Message
From: seanfields
To: rasmataz
Posted: Sat Feb 16, 2008 4:50 pm
Subject: Vacuum modulator and color of smoke
It was grey and maybe blue. My mechanic said it was oil burning. He said the Vacuum modulator when it goes bad burns oil. It's a trans part. My question when he cleaned the fuel injection system could he have done something wrong and created the problem? When I first drove the car it seemed to lose a little something when I got it home after driving 50 to 60 miles then back down to a stop and going again it seemed to want to stall right around 20 but would pick up. The next morning is when the smoke happened. It's not a steady stream of smoke just happened 4 or 5 times before I got it back to him. I probably drove the car 20 miles at least before returning to his shop. Could there be damage to a piston or a valve due to a fuel mixture problem with the fuel injection system after he cleaned it.

I don't think the injection cleaning will caused the smoke

If the vacuum modulator is leaking transmission fluid will be drawned into the intake and get burn in the combustion chamber and as a result it will produce a whitish looking color.

Bluish color is an indication of oil being burned-get the engine compresssion checked to identify a problem with valves and rings

Has the check engine light come on? HAve you checked fuel pump pressure? Have you checked to make sure the catylatic converter isn't plugged?

Let me know.
Joe