Question about 1995 Chevrolet Beretta

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Intermediate problem. Runs fine and then all of a sudden begins to idle rough with decrease in acceleration. The motor will shake on acceralation. Then all of a sudden the problem disappears and engine runs great. I have replaced alot of items, but suspect a bad tank of gas.

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5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 51 Answers

SOURCE: 2005 chevy colorado runs rough and gets bad gas mileage.

Sounds like it needs spark plugs and wires, and a fuel system treatment.

Posted on Oct 08, 2008

  • 124 Answers

SOURCE: rough idling sluggish acceleration

These 4.3L W motors are common for fuel leaking inside the plenum causing them to run rough and smell like raw fuel. The fuel pressure regulator leaks internally, also the injector spider leaks and the two fuel lines feeding the fuel to the spider. You have to remove the plenum and look for the clean spot. Where the fuel leaks it cleans the oil off. Before you try this check your EGR valve. The EGR valves on these get stuck open with carbon and cause a rough idle. Remove it and look for the plunger it is a small round piece that you can push in and out, make sure it closes fully. You can also clean it with carb clean and they make a replacement gasket with a screen in it to keep chunks out of it. Start with the EGR because it is easier. The parts for under the plenum are available at most any parts store. If you have any problems just ask, and if you can not find the parts I will give you part numbers. Let me know what you find I will be back tomorrow.

Posted on Jan 07, 2009

  • 1 Answer

SOURCE: 2003 Silverado rough idle, idles good after "check engine" light

Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.

Posted on Feb 07, 2009

texastbone
  • 63 Answers

SOURCE: engine shakes alot and muffler sounds rough and shakes alot

i would have it looked at. sounds like a blown head gasket. if so be careful when you start it. bump it a couple of times and see if it feels like it doesnt want to turn over. if you try to start it and the gaskets have leaked onto the piston it can blow the motor up.

Posted on Jan 13, 2010

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