"Sluggish Acceleration"
When a vehicle has a sluggish acceleration it can be quite irritating, but even more concerning it can be life threatening. Making sure your vehicles performance is up to par is crucial,especially when getting on the main interstate.
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Fuel Pump
If a fuel pump is not performing to manufacture specs it will cause your acceleration to plummet.Hesitation,sputtering & misfiring all can be signs your fuel pump is going out.One way to be sure it's your fuel pump or fuel pressure regulator is by testing the fuel pressure at either the fuel rail or fuel filter.

Fuel Filter
A clogged fuel filter will 100% slow your acceleration down and could even cause idle problems as well, the price of fuel filters are reasonably priced at any local auto parts store. It's best to just replace it at 50,000 miles.

Fuel Injectors
Fuel injectors spray fuel but they also regulate how much is added to the combustion chamber,increasing power or decreasing. Fuel injectors have small built in removable filters inside the tip on the injector, you can see these when you pull the injector out of the fuel rail,"they are removable and replaceable."You can  purchase injector cleaning solution that you simply pour in your gas tank at fill up at any local auto parts store. Fuel injectors can be bench tested and clean by a injector cleaning shop, in some cases it's best to replace the entire injector if it's a electrical impedance issue.

Catalytic Converter
Catalytic Converters filter pollution from gases created by the engine with thousands of tiny holes that the exhaust flows thru. The catalytic converter burns the gases before they exit the exhaust and into the atmosphere. Catalytic Converters are made up of a ceramic or metallic substrate coated by an aluminum oxide and platinum. If your vehicle has an abrupt back fire it can damage the catalytic converter causing poor acceleration and poor mpg. If at any point your vehicle had a blown head gasket and the poor acceleration has come after the repair,the catalytic converter could be coated with either anti freeze or burnt oil and will need to be replaced.



Spark Plugs & Plug Wires
Fouled spark plugs and shorted plug wires can cause poor acceleration,misfire and hesitation, replacing them can put your vehicle back to it's original performance level. Rule of thumb is to replace them every 30,000 miles

Distributor Cap, Rotor & Coil packs
Any time you change your spark plugs & wires you should change the cap and rotor as well, doing so can avoid the hassle of trouble shooting another misfire or skipping issue.Coil packs tend to just completely cut out, if your vehicle sounds like a 3 cyl when it's a 4cyl, simply unplug and plug each plug wire while the vehicle is running, the one that doesn't change the engine tune is most likely shot, make sure to use a known good plug & wire is in there first or you could throw away a good coil pack.

Air Filter
In some cases simply changing that old air filter will do the trick, a dirty air filter can kill gas mileage,performance & drive ability. Rule of thumb is to replace it every 45,000 miles.

IACV (Idle Air Control Valve)
A clogged IACV can cause low idle and stalling when the A/C kick's on, the reason this happens is the a/c put's a load on the engine and when that happens the IACV is suppose to increase the rpm, if it's clogged,that wont happen and your vehicle will sputter and can even stall. Clean the IACV can bring your idle back to life. IACV can prevent off the line acceleration also.

Tps (Throttle Positioning Sensor)
A TPS controls your acceleration by sending voltage signals to the ECU then the ECU sends it to the injectors. If your experiencing acceleration or hesitation while increasing the throttle at any point, it could be the "TPS"..a simple multi meter voltage test can rule out if its that's problem or not.