When was the last time the fuel filter was replaced?

Assuming the filter is good, you may need to get fuel pressures checked using a CIS pressure tester.

As you have 88, it has error codes built in...so check them and see if anything pops up. Unless your car is CA, you'll need to build a code reader -- just do a search.

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2016 Monsoon Gray Audi Allroad - 21k
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2003 Gray Mercedes ML350 - 122k