My toyota tacoma when 1st started idles rough, while driving intermittently starts running rough and is slow to accelerate My engine light stays on, begins blinking when engine begins running rough.

Marvin

• 85242 Answers
• Posted on Mar 26, 2009

SOURCE: 1999 Ford Windstar, idles rough, slow acceleration

sounds like a large vacuum hose was knocked off the engine when they pulled the trans out, have that checked.

SOURCE: toyota tacoma 2003 check engine light is

If the car still runs then the problem is not major but may develop into one if unchecked. The sensors in the engine may have detected problems and should be stored in its ECU. If you have a scanner have it connected to the diagnostics it should give you a clue on what to check out.

SOURCE: wrangler check engine light

If the light was flashing when it came on, then it means your engine is misfiring.

A solid light can mean anything from a loose/faulty gas cap to a transmission issue.

This light comes on when the computer detects a fault of some sort in its diagnostic tests. If it keeps detecting this issue, the light will remain on. If the light turns off, then it has detected that the issue may no longer be present.

In order to find out what the exact reason was for your light, You need to have your car computer scanned to retrieve the code that the computer would have stored when the light triggered. Most garages will do this free of charge. The code will tell you what may have caused the light to initially turn on.

SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?

SOURCE: 1999 Mercury Sable 24v OHC engine, starts normal

this is a difficult one..
check for vacuum leaks by possibly a visual inspection and then spraying starting fluid around hoses , intake and so on..if any change, you might have found a vacuum leak/bad gasket.
otherwise, DO clean the Idle Air Control Valve 1st.
then check and clean EGR valve next..