Engine misfires?

2000 FORD EXPLORER
142,568 MILES • 6 CYL • 4WD • AUTOMATIC
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RHINESTONECOWGIRL
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I have a car that i bought used I recetly had a tune up done in November and last night the car started to surge and the check engine light came on. I had my mechanic hook it up to his computer and i have a misfire in chamber 4 the same one that misfired in November. What could cause this issue and what could the approximate cost on parts be?
Mar 8, 2010 at 12:16 PM
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LEGITIMATE007
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could be many things, the plug and wire for that cylinder, could be the injector, could be the intake valve or exhaust valve for that cylinder, intake manifold gasket too. I would check the compression in that cylinder, you could have a burnt valve, I will send you something on checking compression, another thing causing this could be a vacuum leak.

These guides can help us fix it

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

and

https://www.2carpros.com/dia/how_to_check_compression.htm

Please run down these guides and report back.
Mar 8, 2010 at 12:59 PM