1991 chevy silverado 5.7 lt.when i step on throttle hard from stop its like it stops running

Any light's lit on the instrument cluster ? Wrench symbol , check engine ? Any messages - DIC - driver info. center ? 2007 Chevy what 2500 hd ,silverado etc... What size engine 6.6 L .Probably a problem with electronic throttle control . Your best bet ,dealer

You might have to change the switch on the transfer case or check to see if you have a broken wire or fuse blowen hope this helps

Sounds like your rear end may be going out, check your diff.

It is possible for pump to run but not put out pressure. Sounds like you need a pump. There is a valve on the fuel rail where you can test fuel pressure. Its just like a tire valve. Just push in on the center pin to see if you get a spray of fuel. It requires around 55 pounds to run. You will need to connect a gauge to the valve to check for proper pressure.

Try to look for a screw 'stop' for controlling the angle of the opening of the throttle plate on the carburetor. Adjust this screw to keep the engine from stopping while at idle.

check for another vacum leak are all hose or lines at throttle body tight? do you have check engine light on?

The "Change Oil" message displayed on your Chevrolet Silverado's gauge cluster is part of the Oil Life Monitoring System, standard on many GM (General Motors) vehicles. The message appears when it's time for an oil-change; the interval is based on your driving habits (for example, it may appear more frequently if you engage in a lot of stop-and-go traffic). Once you change your Chevy's oil, the message will not disappear; the system must be reset. The process is a bit different between Chevy Silverado models.
jQuery('.intro .thumbnail').each(function(i,e){ jQuery(e).find('img').one('error',function(){ jQuery(e).remove(); }); }); Difficulty: Moderately Easy Instructions

2007 to 2010 Chevrolet Silverado
1. Step 1 Insert your key and turn the ignition to position "C" (Run/On) without starting the engine.
   
2. Step 2 Press the second button from the top on your information center (next to the steering column, car symbol) until "Oil Life" displays on your odometer cluster.
   
3. Step 3 Press and hold the "Reset" button on your information center (check mark symbol) until the "Oil Life" display changes to 100 percent.
   
4. Step 4 Turn your ignition to position "A" (Lock/Off).
   
2002 to 2006 Chevrolet Silverado
5. Step 1 Insert your key into the ignition, and turn it to position "A" (Run/On) without cranking the engine.
   
6. Step 2 Depress the gas pedal three times within five seconds. The "Change Oil" message will begin to flash.
   
7. Step 3 Turn the ignition to position "A" (Lock/Off) once the light stops flashing (about 10 seconds).
   

What your hearing is the door stop which needs some lube. You should be able to accomplish this from the out side using grease or white lithium. The mechanism in the middle of the two hinges is the door stop and keeps the door from opening to far.

Dirty trans filter,stickey trans solinoid,or your torque converter is not unlocking.If you can due it yourself try running some trans flush then replace the filter.

Not sure I have solution to your problem, but
1) Try checking for vacuum /air leaks on the inlet manifold and air intake system.
2) Check all manifold nuts / air hose clamps are not loose.