88 D100 issues

So you never got back to me, did you pull the fuel filter and cut it open.

That TBI setup needs a good amount of fuel pressure too, would bet the in the take fuel pump is failing . . . low pressure.

Wonder where the fuel fiter is on that one, back at the tank like some of the newer cars ???

Pop a new fuel filter and try it again. Think that Dodge has a plastice gas tank, so that helps to prevent rust and sediment in the tank.
Water condensation in the tank though you need to change the fuel filter for that.

Good Luck.

------------------------------------------------------

If you have ever done any body and paint work you know your spray gun does not give you a nice fine mist at low pressure.
Same with the throttle body injectors, they need good pressure to spray a good atominzed pattern. Low fuel pressure is just going to dribble the gas in there like you are pouring it in with a spoon.

One Old mechanic showed me a trick with a timing light to watch the spray patterns of the throttle body injectors when you rev it up to about 1500 rpms.
It pulses the light as you shine it on the working throttle body injectors. You will be able to see if they are spraying nice with this technique.

Hook the timing light up to the battery + and - , then the lead on to number one plug wire. Give it a go, kind of a fun experiment. Should be able to see a nice cone shaped spray, not lopsided off to one side or dribbling out.

Something like in this video below:



not sure this will work on your mopar tbi, but it works on the GM tbi.

If you have a dial type timing light, it will light it up at idle. Been there done that. Works slick. think its 15-18 psi.
fuel filter is under driver side below driver. Be careful not to kink the lines when you change it. Guy replaced a hose, and kinked it. It would start and quit.