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Tbi hesitation

Hesitations are usually from a lean condition...here are couple of other items to check:

-check fuel pressure (13-15psi)
-fuel filter
-replace gasket between throttle body and intake
-vacuum lines
-brake booster leak (also a vacuum leak)
-sticky/dirty EGR valve
-MAP sensor; check the vacuum port for the map sensor and make sure it's not partially plugged with crap

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Have you done anything to mod the motor, intake, headers, etc? Sounds lean. Does it idle funny when it is cold, sign of extreme lean...:confused:
 
I added a rv cam and tbi spacer. Thinking removing the spacer though. Has been getting worse over the months. It almost stalls with A/C on.
 
That would make sense. When I changed my cam, it changed the vacuum parameters in the prom and makes it go lean. To fix it you can contact Howell fuel injection, they can build you a new prom. Might have to go through a mechanic you know as they don't always work with the public.

Mine cost me $200. Best 200 I ever spent, made it not hesitate and made it drivable when cold.
 
forget about the coil. Problems- surging, hesitation. changed-both oil pressure senders, temp sender on intake, newer fuel filter, no vac leaks, map sensor. Any ideas? Thank you for the help thus far.
 
Surging is also a sign of being too lean...

I fought mine for 2 years before I changed the chip. Ported the fuel pump, added larger lines, changed the fuel pressure, less restrictive filter, checked all of the wiring. Checked it with a scanner and added the chip.

Save yourself the time I spent chasing it....find someone with a scanner and have them watch the block learn while you drive it.
 
I changed the tps again and it seems for now that the hesitation went away. Was changed back in may. Now it bucks a little. That I think is the egr.
 
hesitation not completely gone. When I tried to go up on a curb it bogged down for about 1-2 seconds then went up the curb.
 
I found the problem. When I first checked my plugs the few that I did check, they looked fine. Then I check all of them even the ones that I check b4. I found that some were fouled up. It turned out to be the injector cleaner that I used fouled up the plugs. Don't remember what brand of cleaner. Also was the TPS. I went through 3 of them to find a good one. Luckly they had a 1 yr warranty.
 
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