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You mentioned MAF what about throttle body cleaning, new spark plugs (verify correct plugs)?
Pull each plug and label it for future reference. Look for any dark plugs (cyl 3,4 could be loose head...

My 1999 95SE 2.3 with 160,000 miles was pushing air into the coolant reservoir. I thought it was ready for the scrap yard. Bought new head bolts. Number 4 cyl bolt was just sitting there loose and...