Question about Isuzu Rodeo

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1998 isuzu rodeo, v6, auto, 2 wheel drive. no ck eng lite on. plugs and one coil has been changed. drove good for a week . now it seems that at idle u can feel a little miss, and going at eighty miles an hour seems not as brisk. would that be the idle air control, maf, or something else? thanks in advance

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Hi, check that the EGR valve is not sticking or has a vacuum leak. This valve will not operate until the engine is warm.
Check also the engine coolant temp sensor (ECT). This sensor tells the engine computer that the engine has warmed up, so if it is faulty, it could be sending wrong information to the computer. If the sensor is disconnected, wires to it broken, or faulty in full cold mode, it will tell the computer that the engine is very cold, like -40F. The computer will schedule fuel for cold conditions. This is usually way too much fuel for a warm engine and it will rich misfire, idle rough, and be difficult to start warm.
The ECT has two wires going to it and is dedicated to sending information to the engine computer. It has nothing to do with your dash gauge that shows coolant temp. That sender has only one wire and is dedicated to the coolant temp gauge.

Posted on Mar 21, 2011

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