2004 MDX with 88,000 miles. CEL and VTM4 lights has been on/off intermittently (dont know the codes). Dealer first did valve adjustment which lasted for about one month then he did a fuel injector cleaning which also lasted about a month. Now the CEL is back on and he wants to replace all the fuel injectors. Does that sound right? Anyone one else experience the same issue? How much does it cost to replace the fuel injectors from an independent mechanic. The dealers wants over $1000 to replace. TIA.