I have a 1991 Chevy 30 foot motorhome chassis p-30 with a 454 engine tbi. Going up an extended grade, engine loses power, service engine lite comes on and stumbles and surges. Changed fuel filters twice, and problem seem to stop, but only to come back after approx 250 miles. Seems to happen only on a long up grade. On crest of hill and downhill, as load is decreased, lite goes off and truck seems to run more towards normal as time goes on.
The injectors may need cleaned. There may also be a problem with the carburetor not ejecting enough gas to the engine.
my suburban wont start
you need a new cam positioning sensor installed
There are several possible reasons why your car's engine stalls: 1. Failing ICM Ignition control module 2. Failing CPS crankshaft position sensor 3. Failing ECM engine control module 4. Not enough fuel pressure to open the fuel injectors
vacuum leak?
Dirty injectors.
There's a solinoid in the transmission.Suggest to check that first. Turn on interior lights. Start engine. If the lights go out when the engine stalls, you have a bad ignition switch.
This is by design, as the engine is not under load. the engine computer shuts off the fuel injectors, there is no hysteresis so the injectors turn back on quickly once below 4000rpm, and the cycle repeats. This also happens when the speedometer maxes out, in my case, 180kM/h, the fuel injectors shut off.
change fuel filter
Could be faulty ignition coils especially if engine starts when cold then stalls and will not start once warmed up.
It sounds like your alternator is no longer recharging your battery. You probably need a new alternator.
There is most likely something in the gas tank. When the car starts the fuel pump starts sucking in fuel and when the trash gets to it the gas will not be able to flow through the clogged pump so the car stalls. When it stalls the fuel pump stops suction and the trash comes out allowing it to start again.