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run engine and c if what looks like steam comes out of tail pipe if it does u have a gasket problem ur burning coolant either head or possible intake gasket --if no smoke check water pump for fluid movement and noise and also check ur fan for air flow and operation the engine surging would more than likely point towards engine burning the coolant u can also pull the plugs to c if any r wet
usually cleaning the idle speed contrlol valve from carbon buildup, fixes idle surge and stalling. try soaking vave in throttle body cleaner or inyector cleaner.
correct ignition timing should be at 10 degrees btdc at idle ( 850 rpms )
use a timing light connected to no 1 piston ht lead to set the timingby adjusting the distributor to get the light to flash on the timing mark
the vacuum hose is probably to increase idle speed when then ac is on and the surginging indicates a leak in a diaphragm
You are right this is a classic MAF problem or rather the air mass meter AMM which is the MAF working with the closely associated intake air temperature sensor IAT(a little bead like thermistor on wire sitting close to the MAFF in the air stream). The ECU was getting poor information from the MAF. The ECU had to rely on slow input signals from the IAT and feedback from the oxygen sensor on the exhaust to keep the engine running. The ECU hunted for the right mix, first rich and then lean but never settling hence the 'surge and slow' of the engine revs. When you disconnected the MAF you also disconnected the IAT and now the ECU had just the one signal from the oxygen sensor to depend on and so now provides a slightly rich mix giving the rough idle.
You have done the hard work just change the MAF and IAT assembly.
i guess you are talking of the engine increasing the idle speed and decrease in the idle speed amd i right? assuming this is what you are talking ablut, there are several factors to look into but the main sourcefor what we call as engine surge is vacum leak
I took mine in to change the plugs and they said there are four O2 sensors in the fuel mixture system and two were bad. I didn't replace them since they were a little pricey ($500 to replace both) and I have 103,000 on the car. Has very similar roughness and occasional oscillations, but no stalling. Hope this helps.
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