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If you are just talking about the cost of the gaskets there is kind of an upper (plenum) and a lower intake set. If you just need the plenum gasket they are only about 30 dollars. If you need the entire set there are a couple of option. Just a regular set runs you about 70 (that's both the upper plenum and lower intake manifold but FelPro puts out a great gasket set called "permadry" and the runs about 165 dollars. If you were looking for labor cost it depends on the hourly labor rate of the shop you are using. The labor guide says that if you are replacing both upper & lower it shows 3.4 hours in labor. If it's just the plenum it says 2 hours of labor. Hope this is what you are looking for and by the way I am going by the most common engine found for the Windstar for that year and that engine is a 3.8 liter. If you happen to have the 3.0 the prices and labor hours may be different.
From what your describing it sounds like a blown intake gasket, the gasket itself costs under $30 if you are doing this yourself. Be sure to get the manifold gasket and not the plenum gasket too
171 and 174 are engine running lean. Repair cost will depend on cause. Check for vacuum leaks. Start by checking for vacuum lines coming off the engine intake manifold. Make sure they are all attached at both ends and are not cracked, etc. These engines have a lot of intake manifold gasket issues. Spray carb cleaner or starter fluid at the gaskets with the engine running. If the engine revs at all, you have leaky gaskets. This is a bigger job to fix--a few hours labor.
153 and 1151 is an O2 sensor. About $150 bucks to fix that.
I am sure that you could find an intake manifold way cheaper than that at a junkyard that would be good i'm guessing but i'm thinkin prob $75-$100 someone to put it one shouldn't too much
Both of the engine that came in your vehicle have this issue. The upper and lower intake manifold gaskets, and the 3.8L valve cover gasket need to be replaced. DO YOURSELF A FAVOR, and if you do the work or have it done, have the Thermostat replaced at the same time. Book time is about 6 hours to do this repair plus parts.
you probably have a intake manifold gasket leak,,this casues a vacum leak at number 1 cylinder between the intake manifold and the cylinder head the gasket collapses and leaks air this sucking more air into the engine a giving it a high idle like 1200 rpms or more sometimes and this will cause you issue,,,its a typicial issue for the SL1 abd SC1,,,gaskets about $12 at autozone about $40 at dealer and about 5 hours labor to change it,,but thats your issue,,,eventualy it will set a high idle code with the ses light
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